server.js
//引入rexpress
const express = require('express');
//2.创建应用对象
const app = express();
//3.创建路由规则
//request 是对请求报文的封装
//response 是对响应报文的封装
app.get('/server',(request,response) => {
//设置响应
// response.send('HELLO EXPRESS')
//设置响应头 设置允许跨域
response.setHeader('Access-Control-Allow-Origin','*')
//设置响应体
response.send('HELLO AJAX');
});
app.post('/server',(request,response) => {
//设置响应
// response.send('HELLO EXPRESS')
//设置响应头 设置允许跨域
response.setHeader('Access-Control-Allow-Origin','*')
//设置响应体
response.send('HELLO AJAX POST');
});
//4.监听端口启动服务
app.listen(8000, ()=>{
console.log("服务已经启动，8000端口监听中。。");
})
The post rules are set in app.post, and the rest are the same.
POST.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>AJAX POST 请求</title>
<style>
#result{
width: 200px;
height: 100px;
border: solid 1px #903;
}
</style>
</head>
<body>
<div id="result"></div>
<script>
//获取元素对象
const result = document.getElementById("result");
//绑定事件
result.addEventListener("mouseover",function(){
console.log("test");
//创建对象
const xhr = new XMLHttpRequest();
//2.初始化 设置类型于URL
xhr.open('POST','http://127.0.0.1:8000/server');
//3.发送
xhr.send('a=100&b=200');
//4.事件绑定
xhr.onreadystatechange = function(){
//判断
if(xhr.readyState === 4){
if(xhr.status >= 200 && xhr.status< 300){
//处理服务端返回的结果
result.innerHTML = xhr.response;
}
}
}
});
</script>
</body>
</html>
- The request parameters of the post request are written in send.
To realize the function, place the mouse in the div and send the request parameters