1 function createXHR(){
2 if(typeof XMLHttpRequest != "undefined"){
3 createXHR = function(){
4 return new XMLHttpRequest();
5 };
6 }else if(typeof ActiveXObject != "undefined"){
7 createXHR = function(){
8 if(typeof arguments.callee.activeXString != "string"){
9 var versions = ["MSXML2.XMLHttp.6.0","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp"];
10 for(var i=0,len=versions.length;i<len;i++){
11 try{
12 var xhr = new ActiveXObject(versions[i]);
13 arguments.callee.activeXString = versions[i];
14 return xhr;
15 }catch (ex){
16 console.log("异常");
17 }
18 }
19 }
20 return new ActiveXObject(arguments.callee.activeXString);
21 };
22 }else{
23 createXHR = function(){
24 throw new Error("No XHR object available.");
25 };
26 }
27 return createXHR();
28 }
