urlObject.hostname
hostname 属性是 host 组件中不包含 port 的小写主机名部分。
🌐 The hostname property is the lower-cased host name portion of the host
component without the port included.
例如：'sub.example.com'。
🌐 For example: 'sub.example.com'.
hostname 属性是 host 组件中不包含 port 的小写主机名部分。
🌐 The hostname property is the lower-cased host name portion of the host
component without the port included.
例如：'sub.example.com'。
🌐 For example: 'sub.example.com'.