异步加载js文件，在IE11下不行，请问怎么能兼容11？

Question

ie11 readyState ie11

Answer 1

var _doc = document.getElementsByTagName("head")[0];
var jsLoader = createElementByType("script","jsLoader","absolute","0px","0px","0px","0px");
jsLoader.src = "wenjian.js"; 
jsLoader.charset="utf-8";
jsLoader.setAttribute("charset","utf-8");
_doc.appendChild(jsLoader);
if(typeof jsLoader.onreadystatechange != "undefined"){
jsLoader.onreadystatechange = function(){
if (jsLoader.readyState == 'loaded' || jsLoader.readyState == 'complete') {
var isp = remote_ip_info.isp;
ipsDo(isp);
}
}
}else if(typeof jsLoader.onload != "undefined"){
var isp = remote_ip_info.isp;
ipsDo(isp);
}