javascript原生ajax请求

 1     class Ajax{
 2 
 3         constructor(url, method, data, callback_suc, callback_err, callback_run){
 4             this.RT = true;//默认为异步请求
 5             this.url = url;
 6             this.method = method || "POST";
 7             this.data = data || "";
 8             this.callback_suc = callback_suc || function () {};
 9             this.callback_err = callback_err || function () {};
10             this.callback_run = callback_run || function () {};
11             if(!this.url){this.callback_err(); return;}
12             this.createRequest();
13         }
14 
15         createRequest(){
16             let xhr = new XMLHttpRequest();
17             xhr.onreadystatechange = (e)=>{this.run(e);}
18             xhr.open(this.method, this.url, this.RT);
19             xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
20             xhr.send(this.data);
21         }
22 
23         run(e){
24             this.callback_run(e);
25             if(e.target.readyState !== 4 || e.target.status !== 200){return;}
26             this.callback_suc(e);
27         }
28 
29     }
30     //调用:
31     new Ajax(
32         "./main.php", //url：请求地址
33         "POST", //method：请求方法
34         "data=3&sb=2",//data：传递数据
35         (e)=>{//callback_suc：请求完成 回调函数
36             document.write(e.target.responseText);//3
37         },
38         (e)=>{},//callback_err：请求错误 回调函数
39         (e)=>{}//callback_run：请求中 回调函数
40     )

上面是js代码

下面以main.php为例接收请求

1 <?php
2     //接收客户端请求数据data和sb
3     $data = isset($_POST['data']) ? $_POST['data'] : "data为空";
4     $sb = isset($_POST['sb']) ? $_POST['sb'] : "sb为空";
5     //向客户端返回数据
6     echo $data." ".$sb;
7 ?>