NodeJS creates a basic application and applies the template engine_node.js

The purpose of this time is to build a most basic NodeJS server that can realize functions and reflect the workflow of NodeJS and the basic framework of development.
Requirements: nodejs and express have been installed.
1. Build a basic NodeJS server (express, routing)

var express = require(‘express'); //引入express模块 
var app = express(); //调用express()函数，对函数进行初始化 
app.get('/stooges/:name?', function(req, res, next){ //设置第一个路由，期待一个name被输入 
 var name = req.params.name; //获取输入的名字，req.params 
 switch(name?name.toLowerCase():' '){ //对名字进行判断 
 case ‘larry': 
 case ‘curly': 
 case ‘moe': 
  res.send(name + 'is my favorite stooge.'); //符合条件利用res.send发送信息 
 break; 
 default:  
  next(); //next()函数，在function中也有参数传递，它的含义是如果这个路由传递的参数不够不能执行这个路由的话，next()函数表示跳转到下一个函数继续执行（这里是路由） 
} 
}); 
app.get(‘/stooges/*?', function(){ //这里?表示最后的参数可以有也可以没有，同上一个路由相同 
 res.send(‘no stooges listed'); 
}); 
app.get(‘/?', function(req,res){ //什么都没有的时候默认的路由 
 res.send(‘hello world'); 
}); 
var port = 8080; //设定并对端口进行监听 
app.listen(port); 
console.log(‘Listensing on port' + port); 

2. Use Jade template engine and add template rendering

var express = require(‘express'); 
var app = express(); 
//下面三句话完成了对view的设定，包括引擎、模板路径以及其他设定 
app.set(‘view engine', ‘jade'); 
app.set(‘view options', {layout:true}); 
app.set(‘views', __dirname + ‘/views'); 
app.get('/stooges/:name?', function(req, res, next){ 
 var name = req.params.name; 
 switch(name?name.toLowerCase():' '){ 
 case ‘larry': 
 case ‘curly': 
 case ‘moe': 
  res.render(‘stooges', {stooge: name}); //进行视图的渲染，传入模板名即可 
 break; 
 default:  
  next(); 
} 
}); 
app.get(‘/stooges/*?', function(req, res){ 
 res.render(‘stooges', {stooges:null}); 
}); 
app.get(‘/?', function(req, res){ 
 res.render(‘index'); 
}); 
var port = 8080; 
app.listen(port); 
console.log(‘Listensing on port' + port); 

There are three template files in total, namely layout.jade (layout file), index.jade and stooges.jade. The codes of the three template files are as follows:
layout.jade

!!! 5 //代表文档类型是HTML5
html(lang=”en”)
head
 title My Web Site
 block scripts
block content
 

index.jade

entends layout
block content
hi hello world
 

stooges.jade

extends layout
block content
if(stooge)
 p #{stooge} is my favorite stooge. //这里的#{stooge}获取了js渲染模板时传递进来的参数
Else
 p no stooges listed 

With the above code, you can use node.js and express to build a basic node application.