简单的路由分配

/** * Created by Administrator on 2017-2-13. */var http = require("http");var server = http.createServer(function(req,res){   if(req.url === "/"){       res.writeHead(200,{"Content-Type":"text/html;charset=utf-8"});       res.write("<h1 style='color: red;font-size: 50px;text-align: center;'>你好世界</h1>");       res.end("成功!");   }else{       res.writeHead(404,{"Content-Type":"text/html;charset=utf-8"});       res.write("<h1 style='color: red;font-size: 50px;text-align: center;'>404</h1>");       res.end("成功!");   }});server.listen(3333);