nodejs + express + ejs + mongodb 一个非常简单的前后端开发的实例2

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Part2 : LET'S DO "HELLO, WORLD!"

Fire up your favorite text editor or IDE. I like Sublime Text a lot. Point it at your nodetest1 directory and open app.js. This is kind of the heart of your, well, app. Not a big surprise there. Here's a breakdown of what you're going to see:

选择你最喜欢的编辑器或集成开发环境. 我比较喜欢 Sublime Text. 点击你的nodetest1目录下, 打开app.js文件. 这是你的应用的"心脏".

var express = require('express');var routes = require('./routes');var user = require('./routes/user');var http = require('http');var path = require('path');

1 第一部分换行前的内部如上, This creates a bunch of basic JavaScript variables and ties them to certain packages, dependencies, node functionality, and routes. 这里创建了一连串的JS变量, 连接一些特定的包, 依赖, node和路由.

var app = express();

2 This one's important. It instantiates Express and assigns our app variable to it. The next section uses this variable to configure a bunch of Express stuff. 这个非常重要, 实例化一个Express对象,并赋值给变量app. 后面的部分可以应用该变量配置一些Express内容.

app.get('/', routes.index);app.get('/users', user.list);

3 路由部分

http.createServer(app).listen(app.get('port'), function(){  console.log('Express server listening on port ' + app.get('port'));});

4 这部分创建了我们的http服务并launch它.

A: 第1步: APP.JS的app.get()路由中加入

app.get('/helloworld', routes.helloworld);

B: 第2步: 打开routes/INDEX.JS , 在文件的最后加入如下代码:

exports.helloworld = function(req, res){  res.render('helloworld', { title: 'Hello, World!' });};

C: 第3步: Views下创建helloworld.ejs文件, 文件中输入如下内容

<html><head><title></title></head><body><p>   <%= title %></p></body></html>

Save the file, go to your command prompt, ctrl-c to kill app.js if it's already running, and then type:
保存页面, 转到命令窗口, CTRL + C杀死app.js. (如果应用正在运行), 重新输入node app.js启动.

D: 第4步: http://localhost:3000/helloworld and enjoy the completely asinine text that gets displayed: