POST请求与GET请求
get和post是HTTP协议中的两种发送请求的方法
HTTP是基于TCP/IP的关于数据如何在万维网中通信的协议
一、get请求与querystring
get请求即客户端向server服务端请求数据，如：获取文章列表的分页码等
通过queryString来获取数据，如：liet.html?t=a&page=2
通过浏览器直接访问一个地址即发送get请求，如：地址栏输入url或者点击超链接访问页面
通过URL模块来获取get请求数据
const http = require('http');
const url = require('url');
const querystring = require('querystring');
http.createServer(function(req, res){res.writeHead(200, {'Content-Type': 'text/plain;charset=utf8'});//解析URL参数let params = url.parse(req.url, true).query;res.write('网站名' + params.name);res.write('\\n');res.write('网站URL：' + params.url);res.end();}).listen(3000);二、post请求与postdata
post请求，即客户端向服务器传递数据，如微博发布文章等
通过post data传递数据
浏览器无法直接模拟，使用postman来模拟post请求发送数据
const server = http.createServer(function(req, res){let str = "", i=0;req.on('data', function(data){console.log(`第${i++}次请求接收数据`);str += data;});res.on('end', function(){let post = querystring.parse(str);console.log(str);res.end(str);})
});server.listen(8080);三、综合案例
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>post请求</title><script src="jquery.min.js"></script><script>$(document).ready(function(){let oUser = $('#username');let oPass = $('#password');let oReg = $('#oReg');let oLogin = $('#oLogin');oReg.click(function(){$.ajax({url: 'http://127.0.0.1:3000/user1',data: {act: 'reg', username: oUser.val(), password: oPass.val()},type: 'POST',dataType: 'JSON',success: function(response){console.log(response);if(response.flag){alert(response.msg);}else{alert(response.msg)}},error: function(error){console.log(error);}})});oLogin.click(function(){$.ajax({url: 'http://127.0.0.1:3000/user1',data: {act: 'login', username: oUser.val(), password: oPass.val()},type: 'POST',dataType: 'JSON',success: function(response){console.log(response);if(response.flag){alert(response.msg);}else{alert(response.msg)}},error: function(error){console.log(error);}})})})</script>
</head>
<body>
<form action="">用户名：<input type="text" name="username" id="username"/><br>密码：<input type="password" name="password" id="password"/><br><input type="button" id="oReg" value="注册"><input type="button" id="oLogin" value="登录"><br>
</form>
</body>
</html>
const http = require('http');
const querystring = require('querystring');
let users = {'admin': 12345, 'Tom': 123};const server = http.createServer((req, res)=>{res.writeHead(200, {'Access-Control-Allow-Origin': '*','Content-Type': 'application/json;charset=utf-8'});let postData = '';req.on('data', chunk => {postData += chunk;})req.on('end', ()=>{if(req.url != '/favicon.ico'){// console.log(postData)let obj = querystring.parse(postData);// console.log(obj.username);let username = obj.username;let password = obj.password;let act = obj.act;console.log(req.url)if(req.url == '/user1'){switch(act){case 'reg':if(users[username]){res.write('{"flag": false, "msg": "此账号已存在！"}');}else{users[username] = password;res.write('{"flag": true, "msg": "注册成功！"}');}break;case 'login':if(users[username] == null){res.write('{"flag": false, "msg": "此账号不存在！"}');}else if(users[username] !== password){res.write('{"flag": false, "msg": "密码错误！"}');}else {res.write('{"flag": true, "msg": "登录成功！"}');}break;}}}res.end();})});
server.listen(3000, ()=>{});
const http = require('http');
let users = {'admin': 12345, 'Tom': 123};const server = http.createServer((req, res)=>{if(req.url != '/favicon.ico'){let obj = new URL(req.url, 'http://127.0.0.1/');let username = obj.searchParams.get('username');let password = obj.searchParams.get('password');let act = obj.searchParams.get('act');res.writeHead(200, {// 只针对某个地址实现跨域// 'Access-Control-Allow-Origin': 'http://127.0.0.1:5500',// 所有请求都允许跨域'Access-Control-Allow-Origin': '*','Content-Type': 'application/json;charset=utf-8'});let url=req.url.split('?')[0];if(url == '/user'){switch(act){case 'reg':if(users[username]){res.write('{"flag": false, "msg": "此账号已存在！"}');}else{users[username] = password;res.write('{"flag": true, "msg": "注册成功！"}');}break;case 'login':if(users[username] == null){res.write('{"flag": false, "msg": "此账号不存在！"}');}else if(users[username] !== password){res.write('{"flag": false, "msg": "密码错误！"}');}else {res.write('{"flag": true, "msg": "登录成功！"}');}break;}}}res.end();
});
server.listen(3000, ()=>{});
