1 function ajax(options){
2 options = options || {};
3 var method = (options.type || "GET").toUpperCase(),
4 url = options.url,
5 queryString = null;
6 if(!url)
7 return;
8 if(options.data){
9 queryString = [];
10 for(var attr in options.data){
11 queryString.push(attr + "=" +options.data[attr]);
12 }
13 queryString = queryString.join("&");
14 }
15 if(method === "GET" && queryString){
16 url += "?"+queryString;
17 queryString = "";
18 }
19 var xhr = new XMLHttpRequest();
20 xhr.open(method,url,true);
21 if(method === "POST")
22 xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
23 xhr.send(queryString);
24 xhr.onreadystatechange = function(){
25 if(xhr.readyState === 4){
26 if(xhr.status === 200){
27 var data = xhr.responseText;
28 if(options.dataType === "json")
29 data = JSON.parse(data);
30 options.success && options.success(data);
31 }else{
32 options.error && options.error(xhr.status);
33 }
34 }
35 }
36 }
