IDIOTliver

在app.js里面写//跨域app.all('*', function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers", "X-Requested-With,X_Requested_With,Content-Type"); // res.header("Content-Type", "application/jso

创建连接数据库的文件dbOpneconst mysql=require("mysql"); //引入数据库模块function query(sql,arr,callback) { //与数据库建立连接 const db=mysql.createConnection({ host:'localhost',//数据库地址 user:'root', //账号 password:'',//密码 port:3306,//端口号