JavaScript异步加载方案

“`”

<pre><code>function loadScript(url, callback){
var script = 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: Firefox, Safari, Chrome, and Opera
script.onload = function(){
callback();
};
}
script.src = url;
document.body.appendChild(script);
}
</code></pre>

<pre><code> "“`