url.hostname | Node.js API 文档

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获取和设置 URL 的主机名部分。url.host 和 url.hostname 的关键区别在于，url.hostname 不包含端口。

【Gets and sets the host name portion of the URL. The key difference between url.host and url.hostname is that url.hostname does not include the port.】

const myURL = new URL('https://example.org:81/foo');
console.log(myURL.hostname);
// Prints example.org

// Setting the hostname does not change the port
myURL.hostname = 'example.com';
console.log(myURL.href);
// Prints https://example.com:81/foo

// Use myURL.host to change the hostname and port
myURL.host = 'example.org:82';
console.log(myURL.href);
// Prints https://example.org:82/foo

分配给 hostname 属性的无效主机名值会被忽略。

【Invalid host name values assigned to the hostname property are ignored.】