fetch函数发送ajax请求_fecth调用ajax-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_42524153/article/details/109510923

fetch函数发送ajax请求小示例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>发送请求</button>
    <script>
        const btn = document.querySelector('button');

        btn.onclick = function(){
            fetch('http://127.0.0.1:8000/fetch-server',{
                //请求方法
                method:'post',
                //请求头
                headers:{
                    name:'uncleTip',
                    age:40
                },
                //请求体
                body:'username=admin&password=123'
            }).then(response => {
                //return response.text();
                return response.json();
            }).then(response => {
                console.log(response);
            })
            //fetch函数有两次then()
        }
    </script>
</body>
</html>

服务脚本:

const express = require('express');

const app = express();

app.all('/fetch-server',(request,response)=>{
    //允许跨域
    response.setHeader('Access-Control-Allow-Origin','*');
    //允许自定义header头部信息
    response.setHeader('Access-Control-Allow-Headers','*');
    //设置响应
    //response.send('hello axios ajax');
    const data = {
        name:'tom',
        age:20
    }
    response.send(JSON.stringify(data));
})

app.listen(8000,()=>{
    console.log('服务器已开启...')
})