/*引入需要的 module*/var http=require("http");var fs=require("fs");var server=http.createServer(function(request,response){    if(request.method==="GET"){        switch(request.url){            case "/":            case "/index.html":                fs.readFile("index.html",function(err,data){                    if(err){                        console.log(err);                        throw err;                    }                    response.writeHeader(200,{"Content-Type":"text/html"});                    response.write(data.toString());                    response.end();                });            break;                        case "/add.html":                fs.readFile("add.html",function(err,data){                    if(err){                        console.log(err);                        throw err;                     }                     response.writeHeader(200,{"Content-Type":"text/html"});                    response.write(data.toString());                    response.end();                });                        break;                        case "/remove.html":                fs.readFile("remove.html",function(err,data){                    if(err){                        console.log(err);                        throw err;                     }                     response.writeHeader(200,{"Content-Type":"text/html"});                    response.write(data.toString());                    response.end();                });            break;                        case "/edit.html":                fs.readFile("edit.html",function(err,data){                    if(err){                        console.log(err);                        throw err;                     }                     response.writeHeader(200,{"Content-Type":"text/html"});                    response.write(data.toString());                    response.end();                });            break;                        case "/find.html":                fs.readFile("find.html",function(err,data){                    if(err){                        console.log(err);                        throw err;                     }                     response.writeHeader(200,{"Content-Type":"text/html"});                    response.write(data.toString());                    response.end();                });            break;                        default :                console.log("invalid  request URL :"+request.url);                fs.readFile("404.html",function(err,data){                    if(err){                        console.log(err);                        throw err;                     }                     response.writeHeader(404,{"Content-Type":"text/html"});                    response.write(data.toString());                    response.end();                });        }    }});server.listen(80);