1 var xmlHttp;
 2 var iii = 0;
 3 if (window.XMLHttpRequest) {
 4         xmlHttp = new XMLHttpRequest();
 5         if (xmlHttp.overrideMimeType)
 6             xmlHttp.overrideMimeType('text/xml');
 7     } else if (window.ActiveXObject) {
 8         try {
 9             xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
10         } catch (e) {
11             try {
12                 xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
13             } catch (e) {
14             }
15         }
16     }
17 var callback = function(e) {
18         if(e.currentTarget.status == 200){ dohttp(iii)}
19 }
20 var url = ["http://*****"
21             ,"http://*****"
22             ,"http://*****"
23             ,"http://*****"
24             ,"http://*****"
25             ,"http://*****"
26             ,"http://*****"    
27             ]
28 var dohttp = function(i) {
29     iii = i+1;
30     xmlHttp.open("GET", url[i], true);// 异步处理返回 
31     xmlHttp.setRequestHeader("Authorization","bearer 0d6b6c89-3c07-4b8a-9be3-04788191e464")
32     xmlHttp.onreadystatechange = callback; 
33     xmlHttp.setRequestHeader("Content-Type",
34             "application/x-www-form-urlencoded;");
35     xmlHttp.send()
36 }
37 dohttp(0);
38