JS实现根据域名查找IP

直接上代码了，很简单，有 Node 就可以

const dns = require('dns');
const http = require('http');
const url = require('url');

const server = http.createServer((req, res) => {
    // 添加CORS跨域头部信息
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE');
    res.setHeader('Access-Control-Allow-Headers', 'Content-Type');

    // 判断URL是否以/getIp开始
    if (req.url.startsWith('/getIp')) {
        // 解析URL获取查询参数
        const path = url.parse(req.url, true).query;
        console.log(path.domain);

        // DNS查询
        dns.lookup(path.domain, (err, address, family) => {
            if (err) {
                res.writeHead(500, {'Content-Type': 'text/plain'});
                res.end('获取IP地址时出错。');
                console.error('DNS查询时出错:', err);
                return;
            }
            res.writeHead(200, {'Content-Type': 'text/plain'});
            res.end(address);
            console.log('IP地址:', address);
            console.log('IP版本:', family);
        });

        console.log('有人访问了我们的web服务器。');
    } else {
        res.writeHead(404, {'Content-Type': 'text/plain'});
        res.end('未找到');
    }
});

server.listen(3636, () => {
    console.log('服务器运行在 http://localhost:3636');
});