jquery.loadscript/jquery.loadscript.js at master · leiming/jquery.loadscript · GitHub

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/**
 * PluginAutoLoad: Load your plugins on html DOM without javascript code.
 * http://marcbuils.github.com/jquery.pluginautoload/
 * https://github.com/leiming/jquery.loadscript
 *
 * Par Marc Buils ( marc.buils@marcbuils.fr )
 * Lei Ming ( poetcoders@gmail.com )
 * Sous licence LGPL v3 (http://www.gnu.org/licenses/lgpl-3.0.txt)
 *
 * v0.1.1 - 09/16/2015:
 * First release
 *
 * v0.1.2 - 12/09/2015;
 * Fix lazyLoad bug
 */

$(function(){
// lazyload script
// ref: http://www.nczonline.net/blog/2009/07/28/the-best-way-to-load-external-javascript/
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLScriptElement
var_loadScript=function(url,params,callback){

varscript=document.createElement("script");
script.type="text/javascript";

if(script.readyState){//IE
script.onreadystatechange=function(){
if(script.readyState=="loaded"||script.readyState=="complete"){
script.onreadystatechange=null;
callback();
}
};
}else{//Others
script.onload=function(){
callback();
};
}

varscriptsProperties=[
'type','src','htmlFor','event','charset','async','defer','crossOrigin','text','onerror'
];

if(typeofparams==='object'&&!$.isEmptyObject(params)){
for(varkeyinparams){
if(params.hasOwnProperty(key)&&$.inArray(key,scriptsProperties)){
script[key]=params[key];
}
}
}

//当设置script的text属性时，需要在加载script DOM节点前设置src属性，否则会执行text文本内容
script.src=url;
document.getElementsByTagName(params['lazyLoad'] ? 'body' : 'head')[0].appendChild(script);
};

$.loadScript=function(p_url,p_params,p_callback){

// Handle p_params is exist
if(arguments.length===2&&typeofarguments[1]==='function'){
p_callback=arguments[1];
p_params={}
}

p_params=p_params||{};

var_return=$.Deferred();

// Call callback if necessary
if(typeof(p_callback)==='function'){
_return.done(function(){
p_callback();
});
}

// Load javascript file
_loadScript(p_url,p_params,function(){
_return.resolve();
});

return_return.promise();
};
})