this指向函数的调用者 举个例子 let pople = { name:"niyanan", age:27, url:niyanan.com, say:function(){ console.log(`我…

const mysql=require('koa-mysql'); let db=mysql.createPool({host: 'localhost', port: 3309, user: 'root', password: '', database: 'an_ju_ke…

{ key:{ type:Date,//数据类型 default:Date.now(),//默认值 unique:true,//不能重复 required:true,//不能为空 //关联表 users:[…