js 判断脚本加载完毕的代码

if(this.isIE) {
js.onreadystatechange=function(){if(js.readyState=="loaded" || js.readyState=="complete") callback();}
}else{js.onload=function(){callback();}}
js.onerror=function(){alert('Not Found (404): '+src)}//chrome

function include_js(file) {
var _doc = document.getElementsByTagName('head')[0];
var js = document.createElement('script');
js.setAttribute('type', 'text/javascript');
js.setAttribute('src', file);
_doc.appendChild(js);
if (!/*@cc_on!@*/0) { //if not IE
//Firefox2、Firefox3、Safari3.1+、Opera9.6+ support js.onload
js.onload = function () {
alert('Firefox2、Firefox3、Safari3.1+、Opera9.6+ support js.onload');
}
} else {
//IE6、IE7 support js.onreadystatechange
js.onreadystatechange = function () {
if (js.readyState == 'loaded' || js.readyState == 'complete') {
alert('IE6、IE7 support js.onreadystatechange');
}
}
}
return false;
}
//execution function
include_js('/jslib//jquery/jquery.js');