node express学习日志

安装

mkdir [项目名]
cd [项目名]
npm init -y


安装依赖
npm i -S express


创建app.js
const express = require('express')

const app = express()

app.get('/', function(req, res) {
    throw new Error('err....')
    res.send('heellp')
})

function errorHandler(err, req, res, next) {
    console.log(err)
    res.status(500).json({
        error: -1,
        msg: err.toString()
    })
}

app.use(errorHandler)

const server = app.listen(5000, function() {
    const {address, port} = server.address()
    console.log('http server is running on http://%s:%s', address, port)
})