1-7 登录/注册

1-1 安装依赖

yarn init -y
yarn add koa koa-router koa-body koa-static koa-mongodb
yarn add koa-art-template art-template

1-2 封装

(1)

//config-index.js
const router=require("../routers");
const koaBody=require("koa-body");
const static=require("koa-static");
const render=require("koa-art-template")
const path=require("path");
// const fs=require("fs")
function initProject(app){
    app.use(koaBody());
    app.use(router.routes());
    var res=path.join(process.cwd(),'static')
    // console.log(res);
    app.use(static(path.join(process.cwd(),"static")));
    render(app, {
        root: path.join(process.cwd(), 'pages'),
        extname: '.html',
        debug: process.env.NODE_ENV !== 'production'
      });
}
module.exports=initProject;

(2)

const router=require("koa-router")();
const main=require("../models")
router.get("/login", async ctx=>{
    await ctx.render("login")
})
router.get("/register", async ctx=>{
    await ctx.render("register")
})
router.get("/home", async ctx=>{
    ctx.body="home"
})

1-3 注册

router.post("/doRegister",async ctx=>{
    console.log(ctx.request.body);
    var {username,pwd}=ctx.request.body;
    var userCollection=await main("user");
    /* 对user查询，没有username才添加 */
    var res=await userCollection.find({username}).toArray();
    /* 1.用户名存在，停留在注册页面 */
    if(res.length){
        ctx.body="<script>alert('用户名已存在');location.href='/register'</script>"
    }else{
        /* 2. 用户名不存在，注册-进入首页 */
        var res=await userCollection.insertOne({username,pwd});
        ctx.body="<script>alert('注册成功');location.href='/home'</script>"
    }
    console.log(res); 
})

1-4 登录

router.post("/doLogin",async ctx=>{
    var {username,pwd}=ctx.request.body;
    var userCollection=await main("user")
    var res=await userCollection.find({username,pwd}).toArray()
    if(res.length){
        await ctx.redirect("/home")
    }else{
        ctx.body="<script>alert('用户名或密码错误');location.href='/login'</script>"
    }
})