express 中的 app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var phonesRouter = require('./routes/phones');
var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({extended: false}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

/* 跨域代碼   */

app.use((req, res, next) => {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS");
    res.header("Access-Control-Allow-Headers", "Content-Type");
    next();
});



app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/phones', phonesRouter);
// catch 404 and forward to error handler
app.use(function (req, res, next) {
    next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

module.exports = app;

express ./routes/phones.js

var express = require('express');
var router = express.Router();

let phones=[
  {id:1,name:'iphone'},
  {id:2,name:'xiaomi'},
  {id:3,name:'huawei'}
]


router.get('/', function(req, res, next) {
  res.json(phones);
});

module.exports = router;

vue的 PhoneSeller.vue代碼

<template>
    <div>
        <div id="seller">

            <form action="#" @submit.prevent="addPhone">
            <input type="text" ref="pname">
            <input type="submit">
            </form>

            <table>
                <caption><h5>手機銷售排行</h5></caption>
                <tr :key="phone.id" v-for="phone of phones">
                    <td>{{phone.id}}</td>
                    <td>{{phone.name}}</td>
                    <td><button @click="deletePhone(phone.id)">刪除</button></td>
                </tr>
            </table>

        </div>
    </div>
</template>

<script>
    export default {
        name: "PhoneSeller",
        data:function () {
            return {
                maxid:2,
                phones:[]
            }
        },
        mounted:function(){
          fetch('http://localhost:3000/phones',{
              method:"GET"
          }).then(res=>res.json())
              .then(phones=>this.phones=phones)
        },

        methods:{
            deletePhone(id){
                let index=this.phones.findIndex(phone=>phone.id==id)
                this.phones.splice(index,1)
            },
            addPhone(){
                let phoneName=this.$refs.pname.value
                let phone={id:++this.maxid,name:phoneName}
                this.phones.push(phone)
            }
        }
    }
</script>

<style scoped>
    #seller{
        width: 500px;
        margin: 0 auto;
    }
    table{
        width: 490px;
        border: 2px solid gray;
        border-collapse: collapse;
    }
    td{
        border: 1px solid gray;
    }
</style>