很多小白不知道ajax怎么学，所以就弄了个node后台模拟下基本的ajax请求。
环境要求是安装node~
先上linkMysql.js
var mysql = require('mysql')var connection = mysql.createConnection({ host: 'localhost', user: 'root', password: '', //自己数据库的密码 database: ''//自己数据库的名称})function LinkMysql(tableName, key, value) { connection.connect() var data = '' var sql = 'SELECT * FROM ' + tableName +' where ' + key + '=' + value console.log(sql) return new Promise(function(resolve,reject) { connection.query(sql, function(err, result) { console.log('--------------------------SELECT----------------------------'); console.log(result); console.log('------------------------------------------------------------\n\n'); resolve(result) }) })}function cutMysql() { connection.end();}module.exports = { cutMysql, LinkMysql} 主JS server.js,提供连接maysql和不连接mysql两种版本
var http = require('http')var url = require('url');var util = require('util');var sqlFunc = require('./linkMysql.js');// 不连接数据库操作// var tempJson = [{// name: '巧克力',// price: 10// },{// name: '薯条',// price: 20// }]http.createServer(function(req, res) { // 跨域处理 res.setHeader("Access-Control-Allow-Origin", "*"); res.setHeader("Access-Control-Allow-Headers", "X-Requested-With"); res.setHeader("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS"); res.setHeader("X-Powered-By",' 3.2.1'); res.setHeader("Content-Type", "application/json"); var reqUrl = req.url var mainPath = reqUrl.split('?')[0] var reqData = reqUrl.split('?')[1].split('=') if (mainPath == '/test') { sqlFunc.LinkMysql('goods_info', reqData[0], JSON.stringify(decodeURIComponent(reqData[1]))).then(function(val) { console.log('从数据库获取数据' + val) sqlFunc.cutMysql(); res.writeHead(200, {'content-Type': 'text/plain; charset=utf-8'}); res.end(JSON.stringify(val)); }) // 不连接数据库操作 // res.writeHead(200, {'content-Type': 'text/plain; charset=utf-8'}); // res.end(JSON.stringify(tempJson)); } else { res.writeHead(404, {'content-Type': 'text/plain; charset=utf-8'}); } }).listen(3000);console.log('Server running at http://localhost:3000'); 最后就是前端html页面了~test.html,用了原生写法，具体的就不讲了百度一大堆~
Document 数据请求
命令行输入
node server.js 启动服务 刷新test.html页面就能拿到数据了~