http://nodejs.cn/api/http.html node html模块api
    http://nodejs.cn/api/fs.html node fs模块api

    目录/
    index.js
    home.html
    about.html
    notfound.html
    pubilc/ // 静态资源文件路径
    img/
    logo.jpg

    1. <!DOCTYPE HTML>
    2. <html lang="zh-cn">
    3.     <head>
    4.         <meta http-equiv="Content-Type" content="text/html;charset:utf-8;" />
    5.         <title>homepage</title>
    6.     <head>
    7.     <body>
    8.         <img href="./img/logo.jpg" alt="logo"/>
    9.     </body>
    10. </html>
    1. <!DOCTYPE HTML>
    2. <html lang="zh-cn">
    3.     <head>
    4.         <meta http-equiv="Content-Type" content="text/html;charset:utf-8;" />
    5.         <title>about</title>
    6.     <head>
    7.     <body></body>
    8. </html>
    1. <!DOCTYPE HTML>
    2. <html lang="zh-cn">
    3.     <head>
    4.         <meta http-equiv="Content-Type" content="text/html;charset:utf-8;" />
    5.         <title>not found</title>
    6.     <head>
    7.     <body>404</body>
    8. </html>
    1. <!DOCTYPE HTML>
    2. <html lang="zh-cn">
    3.     <head>
    4.         <meta http-equiv="Content-Type" content="text/html;charset:utf-8;" />
    5.         <title>about</title>
    6.     <head>
    7.     <body></body>
    8. </html>
    1. // index.js
    2. /** 第一版代码 
    3. var http = require('http');
    4. http.createServer(function(req, res){
    5.     res.writeHead(200, {'Content-Type':'text/plain'});
    6.     res.end('hello world!');
    7. }).listen(3000);
    8. console.log('Server started on localhost:3000; press Ctrl+c to terminate...');
    9. */
    11. /** 第二版代码
    12. var http = require('http');
    13. http.createServer(function(req, res){
    14.     var path = req.url.replace(/\?(?:\?.*)?$/, '').toLowerCase();
    15.     switch(path) {
    16.         case '':
    17.             res.writeHead(200, {'Content-Type':'text/plain'});
    18.             res.end('Homepage!');
    19.         break;
    20.         case '/about':
    21.             res.writeHead(200, {'Content-Type':'text/plain'});
    22.             res.end('about!');        
    23.         break;
    24.         default:
    25.             res.writeHead(404, {'Content-Type':'text/plain'});
    26.             res.end('Not Found!');
    27.         break;
    28.     }
    29. }).listen(3000);
    30. console.log('Server started on localhost:3000; press Ctrl+c to terminate...');
    31. */
    32. var http = require('http'),
    33.     fs = require('fs');
    34. function serverStaticFile(res, path, contentType, responseCode) {
    35.     if(!responseCode) responseCode = 200;
    36.     fs.readFile(__dirname + path, function(err, data){
    37.         if (err) {
    38.             res.writehead(500, {'Content-Type':'text/plain'});
    39.             res.end('500 - Internal Error');        
    40.         } else {
    41.             res.writeHead(responseCode, { 'Content-Type': contentType });
    42.             res.end(data);
    43.         }
    44.     });
    45. }
    46. http.createServer(function(req, res){
    47.     var path = req.url.replace(/\?(?:\?.*)?$/, '').toLowerCase();
    48.     switch(path) {
    49.         case '':
    50.             serverStaticFile(res, '/home.html', 'text/html');
    51.         break;
    52.         case '/about':
    53.             serverStaticFile(res, '/about.html', 'text/html');      
    54.         break;
    55.         case '/img/logo.jpg':
    56.             serverStaticFile(res, '/img/logo.jpg', 'image/jpeg');       
    57.         break;
    58.         default:
    59.             serverStaticFile(res, '/notfound.html', 'text/html', 404);
    60.         break;
    61.     }
    62. }).listen(3000);
    63. console.log('Server started on localhost:3000; press Ctrl+c to terminate...');