nodejs路由＜一＞

const http = require("http");
const fs = require("fs");

function startServer(){
    let create = function (req, res){
        if (req.url === "/" || req.url === "/home" ){
            res.writeHead(200,{"Content-Type":'text/html'});
            fs.createReadStream(__dirname+"/Hello.html",'utf8').pipe(res);
        }else if (req.url === "/index"){
            res.writeHead(200,{"Content-Type":'text/html'});
            fs.createReadStream(__dirname+"/Index.html",'utf8').pipe(res);
        }else if (req.url === "/json"){
            res.writeHead(200,{"Content-Type":'application/json'});
            const json = {
                name:"king",
                age:34
            }
            res.end(JSON.stringify(json));
        }else{
            res.writeHead(404,{"Content-Type":'text/html'});
            fs.createReadStream(__dirname+"/404.html",'utf8').pipe(res);
        }
    }
    let server = http.createServer(create);
    server.listen(3000,'127.0.0.1');
    console.log("server started on localhost port 3000");
}
exports.startServer = startServer;
startServer();