详解用node搭建简单的静态资源管理器

var http = require("http");var url = require("url");var fs = require("fs");var path = require("path");

var extname = path.extname(pathname);

var http = require("http");var url = require("url");var fs = require("fs");var path = require("path");http.createServer(function(req,res) {  //得到用户路径  var pathname = url.parse(req.url).pathname;  //判断此时用户输入的是文件地址还是文件夹地址  //如果是文件夹地址，那么自动请求文件夹中的index.html  if(pathname.indexOf(".") == -1) {    pathname = "index.html";  }  //拓展名  var extname = path.extname(pathname);  //把文件读出来  res.writeHead(200,{"Content-type":"text/html;charset=UTF-8"});  fs.readFile("./static/"+pathname,function(err,data) {    if(err) {      //如果此文件不存在，就因该用404返回      fs.readFile("./static/404.html",function(err,data) {        res.writeHead(404,{"Content-type":"text/html;charset=UTF-8"});        res.end(data);      });      return;      //res.end('<center>服务器傲娇的向你抛出了一个404错误</center')    };    //MIME类型，就是    //网页文件：ttext/html    //jpg文件：image/jpg    getMime(extname,function(mime) {      res.writeHead(200,{"Content-type":mime});      res.end(data);    });  });}).listen(3000,"127.0.0.1");function getMime(extname,callback) {  fs.readFile("./static/data.json",function(err,data) {        if(err) {      throw Error("找不到data,json文件");      return;    }    var data = JSON.parse(data);    var mime = data[extname]||"text/plain";    callback(mime);  });  /*switch(extname) {    case:".html":      return "text/html";      break;    case ".jpg" :      return "image/jpg";      break;     case ".css" :      return "text/css";      break;  }*/  }