2. 2

3. 3

4. 4

5. 5

6. 6

7. 7

8. 8
node
> console.log('Hello World');
Hello World

9. 9
console.log('Hello World');
>node app.js
Hello World

10. 10
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.end('Hello Worldn');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');

11. 11
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.end('Hello Worldn');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');

12. 12

13. 13
exports.helloworld = function () {
console.log('Hello World');
}
var test = require('./test.js');
test.helloworld();

14. 14
module.exports = function () {
this.name = "test object";
this.color = "red";
this.size = "large";
}
var test = require('./test.js');
var testObject = new test();
console.log('name:' + testObject.name);
console.log('color:' + testObject.color);
console.log('size:' + testObject.size);

15. 15

16. 16

17. 17
{
"name": "TestNodejsApp",
"version": "0.0.0",
"description": "TestNodejsApp",
"private": true,
"main": "app.js",
"author": {
"name": "Qiong Wu",
"email": ""
},
"dependencies": {
"express": "3.4.4",
"jade": "*",
"stylus": "*"
}
}

18. 18

19. 19

20. 20
server.on('connection', function
(stream) {
console.log('someone connected!');
});
server.once('connection', function
(stream) {
console.log('Ah, we have our first
user!');
});

21. 21
function Test(colour) {
this.colour = colour;
events.EventEmitter.call(this);
this.sendEvent = function()
{
this.emit('EventSent');
}
}
Test.prototype.__proto__ = events.EventEmitter.prototype;
var testObject = new Test('white');
testObject.on('EventSent', function() {
console.log('Event received');
});
testObject.sendEvent();

22. 22

23. 23
// write 'hello, ' and then end with 'world!'
http.createServer(function (req, res) {
res.write('hello, ');
res.end('world!');
// writing more now is not allowed!
});

24. 24