node —— 静态资源文件管理

var http = require("http");

var url = require("url");

var fs = require("fs");

var path = require("path");

http.createServer(function(req,res){

    //得到用户的路径

    var pathname = url.parse(req.url).pathname;

    //默认首页

    if(pathname == "/"){

        pathname = "index.html";

    }

    //拓展名

    var extname = path.extname(pathname);

    //真的读取这个文件

    fs.readFile("./static/" + pathname,function(err,data){

        if(err){

            //如果此文件不存在，就应该用404返回

            fs.readFile("./static/404.html",function(err,data){

                res.writeHead(404,{"Content-type":"text/html;charset=UTF8"});

                res.end(data);

            });

            return;

        };

      

        var mime = getMime(extname);

        res.writeHead(200,{"Content-type":mime});

        res.end(data);

    });

}).listen(3000,"127.0.0.1");

function getMime(extname){

    switch(extname){

        case ".html" :

            return "text/html";

            break;

        case ".jpg" :

            return "image/jepg";

            break;

        case ".png" :

            return "image/png";

            break;

        case ".css":

            return "text/css";

            break;

        case ".js":

            return "application/javascript";

            break;

        case ".json":

            return "application/json";

            break;  

    }

}