http协议概述

请求的常用方法

这四种请求方法仅仅只是发送了请求而已，具体的功能还是要通过具体的代码来实现

http协议的状态码

用postman请求常用方法

• get请求
  

• post请求
  

• put请求
  id=1，苹果香蕉鸭梨变成了苹果草莓鸭梨
  

• delete请求
  苹果草莓鸭梨变成了苹果鸭梨
  

server.js

const Koa = require("koa");
const router = require("koa-router")();
const parser = require("koa-parser");
const app = new Koa();

app.use(parser());

let dataList = ["香蕉","苹果","鸭梨"];

//get查看
router.get("/fruits", ctx =>{
    ctx.body = dataList;
});

//post添加
router.post("/fruits", ctx =>{
    let fruit = ctx.request.body.fruit;
    dataList.push(fruit);
    ctx.body = dataList;
});

//put修改
router.put("/fruits/:id", ctx =>{//路由传参:id
    let id = ctx.params.id;
    let fruit = ctx.request.body.fruit;
    dataList.splice(id,1,fruit);
    ctx.body = dataList;
});

//delete删除
router.delete("/fruits/:id", ctx =>{
    let id = ctx.params.id;
    dataList.splice(id,1);
    ctx.body = dataList;
});

app.use(router.routes());

app.listen("3000",() => {
    console.log("server is running");
});