问Node.js服务器响应javascript文件，而不是主.html？

EN

const http = require('http');
const path = require('path');
const fs = require('fs');

let contacts = {
    "1234": { 
        id: "1234",
        phone: "77012345678",
        name: "Sauron",
        address: "1234 Abc"
    },
    "4567": { 
        id: "4567",
        phone: "77012345678",
        name: "Saruman",
        address: "Orthanc, Isengard"
    },
};

let loadStatic = (req, res) => {
    res.writeHead(200, {'Content-Type': 'text/html'});
    fs.readFile('./index.html', null, (err,data) => {
        if (err) {
            return console.log('error');
        } else {
            res.write(data);
        }
        res.end();
    });
}

let routes = [
    {
        method: 'GET',
        url: /^\/contacts\/[0-9]+$/,
        run: getContact
    },
    {
        method: 'DELETE',
        url: /^\/contacts\/[0-9]+$/,
        run: deleteContact
    },
    {
        method: 'GET',
        url: /^\/contacts\/?$/,
        run: getContacts
    },
    {
        method: 'POST',
        url: /^\/contacts\/?$/,
        run: createContact
    },
    {
        method: 'GET',
        url: /\/hi\//,
        run: loadStatic
    },
    {
        method: 'GET',
        url: /^.*$/,
        run: notFound
    }
];


let server = http.createServer((req, res) => {
    
    let route = routes.find(route =>
        route.url.test(req.url) &&
        req.method === route.method
    );
    route.run(req, res);
});

server.listen(3000);

Request URL: http://localhost:3000/hi/index.js
Request Method: GET
Status Code: 200 OK
Remote Address: [::1]:3000
Referrer Policy: no-referrer-when-downgrade
Connection: keep-alive
Content-Type: text/html
Date: Mon, 20 Aug 2018 23:41:45 GMT
Transfer-Encoding: chunked