Node.js（四）json

npm init -y(初始化项目)

npm install express（引入express）

npx express-generator -e（自动生成模板。添加对 ejs 模板引擎的支持）

npm i --save lodash（引入lodash）

路由配置carApi.js

const express=require("express");
let router=express.Router();
const _=require("lodash");

var cars=[];
cars.push({id:201701,name:"BMW",price:190,speed:"210km/h",color:"白色"});
cars.push({id:201702,name:"BYD",price:25,speed:"160km/h",color:"红色"});
cars.push({id:201703,name:"Benz",price:300,speed:"215km/h",color:"蓝色"});
cars.push({id:201704,name:"Honda",price:190,speed:"170km/h",color:"黑色"});
cars.push({id:201705,name:"QQ",price:130,speed:"210km/h",color:"白色"});

//Get
router.get("/",(req,res,next)=>{
    res.json({status:"ok","data":cars});
})
//查找单个汽车根据名称
router.get("/:name",(req,res,next)=>{
    //查找编号为id的汽车
    let car=_.filter(cars,{name:req.params.name})
    res.json({"data":car});
})
//查找单个汽车根据id
router.get("/edit/:id",(req,res,next)=>{
    //查找编号为id的汽车
    let car=_.find(cars,{id:parseInt(req.params.id)})
    res.json({status:"ok","data":car});
})
//排序
router.get("/order/orderBy",(req,res,next)=>{
    let car=_.orderBy(cars,["id"],["desc"]);
    console.log(car);
    res.json({status:"ok","data":car});
})
//Post
router.post("/",(req,res,next)=>{
    let car=req.body;
    let obj=_.last(_.sortBy(cars,["id"]));
    car.id=obj.id+1;
    cars.push(car);
    res.json({status:"ok","data":car});
})

//Put
router.put("/",(req,res,next)=>{
    let srcCar=req.body;
    let car=_.find(cars,{id:parseInt(srcCar.id)})
    car.name=srcCar.name;
    car.speed=srcCar.speed;
    car.price=srcCar.price;
    car.color=srcCar.color;
    res.json({status:"ok","data":car})
})

//Delete
router.delete("/:id",(req,res,next)=>{
    let indnx=_.findIndex(cars,{id:parseInt(req.params.id)})
    cars.splice(indnx,1)
    res.json({status:"ok","data":""})
})

module.exports=router;