一个网站可以有二个域名

server {
    listen 80;
    server_name main.com www.main.com;

    location / {
        root /var/www/main;
        index index.html;
    }
}

server {
    listen 80;
    server_name blog.main.com;

    location / {
        root /var/www/blog;
        index index.html;
    }
}

const express = require('express');
const app = express();

app.use((req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
    next();
});

app.get('/', (req, res) => {
    res.send('Hello World!');
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});