// 动态插入script标签 function createScript(url, callback){ var oScript = document.createElement('script'); oScript.type = 'text/javascript'; oScript.async = true; oScript.src = url; /* ** script标签的onload和onreadystatechange事件 ** IE6/7/8支持onreadystatechange事件 ** IE9/10支持onreadystatechange和onload事件 ** Firefox/Chrome/Opera支持onload事件 */ // 判断IE8及以下浏览器 var isIE = !-[1,]; if(isIE){ alert('IE') oScript.onreadystatechange = function(){ if(this.readyState == 'loaded' || this.readyState == 'complete'){ callback(); } } } else { // IE9及以上浏览器，Firefox，Chrome，Opera oScript.onload = function(){ callback(); } } document.body.appendChild(oScript); }

createScript('xxx.js', function(){ console.log('OK'); });