Use express to start server service method sharing

This article mainly shares with you how to use express to start a server service. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.

Install express

$ npm install express --save

In node.js, our most commonly used framework is express

Express It is a minimalist and flexible web application development framework based on the Node.js platform. It provides a series of powerful features to help you create various web and mobile device applications.

The first step

We need to reference this framework

let express=require('express');

The second step

We mount this framework on a variable to make it easier for us to call the express built-in method later

let app=express()

The third step

We want to monitor Our service port number

app.listen(8080)

-------------------------- -----------

Below I wrote some routes to match the path name requested by the front-end, and then return some strings to the front-end (because I used the res.end() method, It can only accept strings and buffers, so what I return here is a string)

app.get('path name', function)

The following is an example directly to explain each line of code

//引入express框架
let express=require('express');

//定义一个变量调用express各种方法
let app=express();
// app上有很多匹配请求方法 app.get app.post app.put app.delet
//app定义路由，其实也是一个函数，定义的很多方法
//当客户端以GET方式访问服务器/路由时候，会有那个函数进行处理
app.get('/',function (req,res) {
 res.end('home');
})
//当客户的以get方式访问服务器/user路径时候，会有那个函数进行处理
// 三部分 请求 路径 函数
app.get('/user',function (req,res) {
 res.end('user');
})
//app.all能匹配所有的方法，不管客户端请求过来的方法名是什么，都能匹配上
// 所以这个方法一定要放在最后面，意思上前面都没有匹配中后，匹配all
// * 代表所有的路径
app.all('*',function (req,res) {
 res.end('not found')
})
app.listen(8080);

/* listen源码
 var http = require('http');
 app.listen = function listen() {
 var server = http.createServer(this);
 return server.listen.apply(server, arguments);
 };
*
*
*
* */

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