IE对AJAX请求结果会缓存，下一次走本地缓存而不是服务器缓存。

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>IE缓存问题</title>
    <style>
        #result{
            width:200px;
            height:100px;
            border:solid 1px #258;
        }
    </style>
</head>
<body>
    <button>点击发送请求</button>
    <div id="result"></div>
    <script>
        const btn = document.getElementsByTagName('button')[0];
        const result = document.querySelector('#result');

        btn.addEventListener('click', function(){
            const xhr = new XMLHttpRequest();
            xhr.open("GET",'http://127.0.0.1:8000/ie?t='+Date.now());
            xhr.send();
            xhr.onreadystatechange = function(){
                if(xhr.readyState === 4){
                    if(xhr.status >= 200 && xhr.status< 300){
                        result.innerHTML = xhr.response;
                    }
                }
            }
        })
    </script>
</body>
</html>

JS

//1. 引入express
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
//针对 IE 缓存
app.get('/ie', (request, response) => {
    //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 IE - 5');
});

//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....");
});