实现异步加载js文件及加载完成后回调

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兼容IE特有的，火狐、Chrome等一些现代浏览器，加载JS的代码如下：

function loadJS(src, callback){

var script = document.createElement('script');

var head = document.getElementsByTagName('head')[0];

var loaded;

script.src = src;

if(typeof callback === 'function'){

script.onload = script.onreadystatechange = function(){

if(!loaded && (!script.readyState || /loaded|complete/.test(script.readyState))){

script.onload = script.onreadystatechange = null;

loaded = true;

callback();

}

head.appendChild(script);

}

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