Location：host 属性

const anchor = document.createElement("a");

anchor.href = "https://developer.mozilla.org/zh-CN/Location.host";
console.log(anchor.host === "developer.mozilla.org");

anchor.href = "https://developer.mozilla.org:443/zh-CN/Location.host";
console.log(anchor.host === "developer.mozilla.org");
// 由于 443 是该协议方案的默认端口号，因此未包含此端口号。

anchor.href = "https://developer.mozilla.org:4097/zh-CN/Location.host";
console.log(anchor.host === "developer.mozilla.org:4097");