Ajax get/post 方法封装

 1 function get(url, options, callback){
 2     var xml = new XMLHttpRequest();
 3     xml.onreadystatechange(){
 4         if(xml.readyState === 4){
 5             if(xml.status >= 200 && xml.status < 300 || xml.status === 304){
 6                 callback(xml.responseText);
 7             }else{
 8                 throw new Error("请求未成功：" + xml.status )
 9             }
10         }
11     }
12     var seriUrl = url + ‘?‘ + serialize(options);
13     xml.open(‘get‘, seriUrl, true);
14     xml.send(null);
15 }
16 function serialize(data){
17     if(!data) return ‘‘;
18     var pairs = [], value;
19     for(name in data){
20         if(!data.hasOwnProperty(name)) continue;
21         if(typeof data[name] === ‘function‘) continue;
22         value = data[name].toString();
23         name = encodeURIComponent(name);
24         value = encodeURIComponent(value);
25         pairs.push(name + ‘=‘ + value);
26     }
27     return pairs.join(‘&‘);
28 }