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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

image-20211101234137215

II-2. DOM - ์กฐ์ž‘

image-20211101234646120

image-20211101234542018

BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

image-20211102162327438

// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

image-20211102162629375

// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

image-20211102162740531


III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

image-20211102163100145

// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

image-20211102163804473


III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all \u003cpre\u003e\u003ccode\u003e blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks"); } } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); } })(); (function(){ try { var __m = "github.com"; var __re = new RegExp('^' + "github\\.com" + '
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

image-20211101234137215

II-2. DOM - ์กฐ์ž‘

image-20211101234646120

image-20211101234542018

BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

image-20211102162327438

// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

image-20211102162629375

// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

image-20211102162740531


III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

image-20211102163100145

// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

image-20211102163804473


III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

image-20211101234137215

II-2. DOM - ์กฐ์ž‘

image-20211101234646120

image-20211101234542018

BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

image-20211102162327438

// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

image-20211102162629375

// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

image-20211102162740531


III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

image-20211102163100145

// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

image-20211102163804473


III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length \u003e 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

image-20211101234137215

II-2. DOM - ์กฐ์ž‘

image-20211101234646120

image-20211101234542018

BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

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// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

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// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

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III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

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// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

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III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

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III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

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Most Popular Programming Language in 2021 survey

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II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

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II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

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II-2. DOM - ์กฐ์ž‘

image-20211101234646120

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BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

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DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

image-20211102162327438

// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

image-20211102162629375

// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

image-20211102162740531


III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

image-20211102163100145

// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

image-20211102163804473


III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

image-20211101234137215

II-2. DOM - ์กฐ์ž‘

image-20211101234646120

image-20211101234542018

BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

image-20211102162327438

// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

image-20211102162629375

// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

image-20211102162740531


III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

image-20211102163100145

// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

image-20211102163804473


III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

image-20211101234137215

II-2. DOM - ์กฐ์ž‘

image-20211101234646120

image-20211101234542018

BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

image-20211101235134913

III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

image-20211102162327438

// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

image-20211102162629375

// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

image-20211102162740531


III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

image-20211102163100145

// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

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III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
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JavaScript Intro

I. JavaScript์˜ ํ•„์š”์„ฑ

  • ๋ธŒ๋ผ์šฐ์ € ํ™”๋ฉด์„ ๋™์ ์œผ๋กœ ๋งŒ๋“ค๊ธฐ ์œ„ํ•จ
  • ๋ธŒ๋ผ์šฐ์ €๋ฅผ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ์œ ์ผํ•œ ์–ธ์–ด

image-20211101233639192

Most Popular Programming Language in 2021 survey

image-20211101233630795

II. DOM(Document Object Model)

DOM ์ด๋ž€?

  • HTML, XML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์œ„ํ•œ ๋ฌธ์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์ธํ„ฐํŽ˜์ด์Šค
  • ๋ฌธ์„œ๋ฅผ ๊ตฌ์กฐํ™”ํ•˜๊ณ  ๊ตฌ์กฐํ™”๋œ ๊ตฌ์„ฑ ์š”์†Œ๋ฅผ ํ•˜๋‚˜์˜ ๊ฐ์ฒด๋กœ ์ทจ๊ธ‰ํ•˜์—ฌ ๋‹ค๋ฃจ๋Š” ๋…ผ๋ฆฌ์  ํŠธ๋ฆฌ ๋ชจ๋ธ
  • ๋ฌธ์„œ๊ฐ€ ๊ตฌ์กฐํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ ๊ฐ ์š”์†Œ๋Š” ๊ฐ์ฒด(object)๋กœ ์ทจ๊ธ‰
  • ๋‹จ์ˆœํ•œ ์†์„ฑ ์ ‘๊ทผ, ๋ฉ”์„œ๋“œ ํ™œ์šฉ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์  ํŠน์„ฑ์„ ํ™œ์šฉํ•œ ์กฐ์ž‘ ๊ฐ€๋Šฅ
  • ์ฃผ์š” ๊ฐ์ฒด
    • window : DOM์„ ํ‘œํ˜„ํ•˜๋Š” ์ฐฝ. ๊ฐ€์žฅ ์ตœ์ƒ์œ„ ๊ฐ์ฒด (์ž‘์„ฑ ์‹œ ์ƒ๋žต ๊ฐ€๋Šฅ)
    • document : ํŽ˜์ด์ง€ ์ปจํ…์ธ ์˜ Entry Point ์—ญํ• ์„ ํ•˜๋ฉฐ, ๋“ฑ๊ณผ ๊ฐ™์€ ์ˆ˜๋งŽ์€ ๋‹ค๋ฅธ ์š”์†Œ๋“ค์„ ํฌํ•จ
    • navigator, location, history, screen

image-20211101234035397

II-1. DOM - ํ•ด์„

ํŒŒ์‹ฑ(Parsing)

  • ๊ตฌ๋ฌธ ๋ถ„์„, ํ•ด์„
  • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ฌธ์ž์—ด์„ ํ•ด์„ํ•˜์—ฌ DOM Tree๋กœ ๋งŒ๋“œ๋Š” ๊ณผ์ •

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II-2. DOM - ์กฐ์ž‘

image-20211101234646120

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BOM(browser Object Model) ์ด๋ž€?

  • ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋ธŒ๋ผ์šฐ์ €์™€ ์†Œํ†ตํ•˜๊ธฐ ์œ„ํ•œ ๋ชจ๋ธ
  • ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ์ด๋‚˜ ํ”„๋ ˆ์ž„์„ ์ถ”์ƒํ™”ํ•ด์„œ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์œผ๋กœ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋„๋ก ์ œ๊ณตํ•˜๋Š” ์ˆ˜๋‹จ
    • ๋ฒ„ํŠผ, URL ์ž…๋ ฅ์ฐฝ, ํƒ€์ดํ‹€ ๋ฐ” ๋“ฑ ๋ธŒ๋ผ์šฐ์ € ์œˆ๋„์šฐ ๋ฐ ์›น ํŽ˜์ด์ง€ ์ผ๋ถ€๋ถ„์„ ์ œ์–ด ๊ฐ€๋Šฅ
  • window ๊ฐ์ฒด๋Š” ๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ์ง€์›๋ฐ›์œผ๋ฉฐ ๋ธŒ๋ผ์šฐ์ €์˜ ์ฐฝ(window)๋ฅผ ์ง€์นญ

II - 3. BOM - ์กฐ์ž‘

image-20211101235108530

JavaScript Core

  • ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด

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III. DOM ์กฐ์ž‘

DOM ์กฐ์ž‘ - ๊ฐœ๋…

  • Document๋Š” ๋ฌธ์„œ ํ•œ ์žฅ(HTML)์— ํ•ด๋‹นํ•˜๊ณ  ์ด๋ฅผ ์กฐ์ž‘
  • DOM ์กฐ์ž‘ ์ˆœ์„œ
    • ์„ ํƒ (Select)
    • ๋ณ€๊ฒฝ (Manipulation)

DOM ์กฐ์ž‘ - Document ์œ„์น˜

image-20211102000136116

DOM ๊ด€๋ จ ๊ฐ์ฒด์˜ ์ƒ์† ๊ตฌ์กฐ

  • EventTarget

    • Event Listener๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ์ฒด๊ฐ€ ๊ตฌํ˜„ํ•˜๋Š” DOM ์ธํ„ฐํŽ˜์ด์Šค
  • Node

    • ์—ฌ๋Ÿฌ ๊ฐ€์ง€ DOM ํƒ€์ž…๋“ค์ด ์ƒ์†ํ•˜๋Š” ์ธํ„ฐํŽ˜์ด์Šค
  • Element

    • Document ์•ˆ์˜ ๋ชจ๋“  ๊ฐ์ฒด๊ฐ€ ์ƒ์†ํ•˜๋Š” ๊ฐ€์žฅ ๋ฒ”์šฉ์ ์ธ ๊ธฐ๋ฐ˜ ํด๋ž˜์Šค
    • ๋ถ€๋ชจ์ธ Node์™€ ๊ทธ ๋ถ€๋ชจ์ธ EventTarget์˜ ์†์„ฑ์„ ์ƒ์†
  • Document

    • ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋ถˆ๋Ÿฌ์˜จ ์›น ํŽ˜์ด์ง€๋ฅผ ๋‚˜ํƒ€๋ƒ„
    • DOM ํŠธ๋ฆฌ์˜ ์ง„์ž…์ (entry point) ์—ญํ• ์„ ์ˆ˜ํ–‰
  • HTMLElement

    • ๋ชจ๋“  ์ข…๋ฅ˜์˜ HTML ์š”์†Œ
    • ๋ถ€๋ชจ element์˜ ์†์„ฑ ์ƒ์†

image-20211102000710721

DOM ์„ ํƒ - ์„ ํƒ ๊ด€๋ จ ๋ฉ”์„œ๋“œ

  • Document.querySelector(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” element ํ•˜๋‚˜ ์„ ํƒ
    • ์ œ๊ณตํ•œ CSS selector๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ฒซ ๋ฒˆ์งธ element ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ (์—†๋‹ค๋ฉด null)
  • Document.querySelectorAll(selector)
    • ์ œ๊ณตํ•œ ์„ ํƒ์ž์™€ ์ผ์น˜ํ•˜๋Š” ์—ฌ๋Ÿฌ element๋ฅผ ์„ ํƒ
    • ๋งค์นญ ํ•  ํ•˜๋‚˜ ์ด์ƒ์˜ ์…€๋ ‰ํ„ฐ๋ฅผ ํฌํ•จํ•˜๋Š” ์œ ํšจํ•œ CSS selector๋ฅผ ์ธ์ž(๋ฌธ์ž์—ด)๋กœ ๋ฐ›์Œ
    • ์ง€์ •๋œ ์…€๋ ‰ํ„ฐ์— ์ผ์น˜ํ•˜๋Š” NodeList๋ฅผ ๋ฐ˜ํ™˜
  • getElementById(id)
  • getElementsByTagName(name)
  • getElementsByClassName(names)

โ€ป querySelector(), querySelectorAll() ์„ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ 

  • id, class ๊ทธ๋ฆฌ๊ณ  tag ์„ ํƒ์ž ๋“ฑ์„ ๋ชจ๋‘ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, ๋” ๊ตฌ์ฒด์ ์ด๊ณ  ์œ ์—ฐํ•˜๊ฒŒ ์„ ํƒ ๊ฐ€๋Šฅ
    • ex) document.querySelector('#id'), document.querySelectAll('.name')

DOM ์„ ํƒ - ์„ ํƒ ๋ฉ”์„œ๋“œ๋ณ„ ๋ฐ˜ํ™˜ ํƒ€์ž…

  • ๋‹จ์ผ element
    • getElementById()
    • querySelector()
  • HTMLCollection
    • getElementsByTagName()
    • getElementsByClassName()
  • NodeList
    • querySelectorAll()

DOM ์„ ํƒ - HTMLCollection & NodeList

  • ๋‘˜ ๋‹ค ๋ฐฐ์—ด๊ณผ ๊ฐ™์ด ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผํ•˜๊ธฐ ์œ„ํ•œ index๋ฅผ ์ œ๊ณต(์œ ์‚ฌ ๋ฐฐ์—ด)
  • HTMLCollection
    • name, id, index ์†์„ฑ์œผ๋กœ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
  • NodeList
    • index๋กœ๋งŒ ๊ฐ ํ•ญ๋ชฉ์— ์ ‘๊ทผ ๊ฐ€๋Šฅ
    • ๋‹จ, HTMLCollection๊ณผ ๋‹ฌ๋ฆฌ ๋ฐฐ์—ด์—์„œ ์‚ฌ์šฉํ•˜๋Š” forEach ํ•จ์ˆ˜ ๋ฐ ๋‹ค์–‘ํ•œ ๋ฉ”์„œ๋“œ ์‚ฌ์šฉ ๊ฐ€๋Šฅ
  • ๋‘˜ ๋‹ค Live Collection์œผ๋กœ DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜ํ•˜์ง€๋งŒ, querySelectorAll()์— ์˜ํ•ด ๋ฐ˜ํ™˜๋˜๋Š” NodeList๋Š” Static Collection์œผ๋กœ ์‹ค์‹œ๊ฐ„์œผ๋กœ ๋ฐ˜์˜๋˜์ง€ ์•Š์Œ

DOM ์„ ํƒ - Collection

  • Live Collection
    • ๋ฌธ์„œ๊ฐ€ ๋ฐ”๋€” ๋•Œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์—…๋ฐ์ดํŠธ ๋จ
    • DOM์˜ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ collection์— ๋ฐ˜์˜
    • ex) HTMLCollection, NodeList
  • Static Collection (non-live)
    • DOM์ด ๋ณ€๊ฒฝ๋˜์–ด๋„ collection ๋‚ด์šฉ์—๋Š” ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์Œ
    • querySelectorAll()์˜ ๋ฐ˜ํ™˜ NodeList๋งŒ static collection

III - 1. DOM ์„ ํƒ ์‹ค์Šต

Base.html
<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1.0"><title>Document</title><style>
.city-location {color: blue;}</style></head><body><h1>Hello City</h1><h2id="location-header">Location</h2><div><ul><liclass="city-location">์„œ์šธ</li><liclass="city-location">๋Œ€์ „</li><liclass="city-location">๊ด‘์ฃผ</li><liclass="city-location">๊ตฌ๋ฏธ</li><liclass="city-location">๋ถ€์šธ๊ฒฝ</li></ul></div></body></html>

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// 1. Selection// 1-1. window & documentconsole.log(window)console.log(document)console.log(window.document)
// 1-2. querySelectorconsth1=document.querySelector('h1')consth2=document.querySelector('h2')constsecondH2=document.querySelector('#location-header')constselectUlTag=document.querySelector('div > ul')

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// 1-3. querySelectorAllconstliTags=document.querySelectorAll('li')constsecondLiTags=document.querySelectorAll('.city-location')

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III - 2. DOM ๋ณ€๊ฒฝ ์‹ค์Šต

// 2. Creation & Append// 2-1. createElementconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')// 2-2. appendnewLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.append(newLiTag)ulTag.append('๋ฌธ์ž์—ด๋„ ์ถ”๊ฐ€ ๊ฐ€๋Šฅ')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'constnew3=document.createElement('li')new3.innerText='๋ฆฌ์ŠคํŠธ 3'ulTag.append(new1,new2,new3)

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// 2-3. appendChildconstulTag=document.querySelector('ul')constnewLiTag=document.createElement('li')newLiTag.innerText='์ƒˆ๋กœ์šด ๋ฆฌ์ŠคํŠธ ํƒœ๊ทธ'ulTag.appendChild(newLiTag)ulTag.appendChild('๋ฌธ์ž์—ด์€ ์ถ”๊ฐ€ ๋ถˆ๊ฐ€')constnew1=document.createElement('li')new1.innerText='๋ฆฌ์ŠคํŠธ 1'constnew2=document.createElement('li')new2.innerText='๋ฆฌ์ŠคํŠธ 2'ulTag.appendChild(new1,new2)

image-20211102163537535

// 2-4. innerText & innerHTMLconstulTag=document.querySelector('ul')constliTag1=document.createElement('li')liTag1.innerText='<li>์ถ˜์ฒœ</li>'constliTag2=document.createElement('li')liTag2.innerHTML='<li>์ถ˜์ฒœ</li>'ulTag.append(liTag1,liTag2)constulTag=document.querySelector('ul')ulTag.innerHTML='<li><a href="javascript:alert(\'๋‹น์‹ ์˜ ๊ฐœ์ธ์ •๋ณด ์œ ์ถœ\')">์ถ˜์ฒœ</a></li>'

image-20211102163745238

image-20211102163804473


III - 3. DOM ์‚ญ์ œ ์‹ค์Šต

// 3. Delete// 3-1. removeconstheader=document.querySelector('#location-header')header.remove()// 3-2. removeChildconstparent=document.querySelector('ul')constchild=document.querySelector('ul > li')constremovedChild=parent.removeChild(child)console.log(removedChild)

image-20211102164233480


III - 4. DOM ์†์„ฑ ์‹ค์Šต

// 4. ์†์„ฑ// 4-1. setAttributeconstheader=document.querySelector('#location-header')header.setAttribute('class','city-location')// 4-2. getAttributeconstgetAttr=document.querySelector('.city-location')getAttr.getAttribute('class')getAttr.getAttribute('style')

image-20211102165648301