前端 window 和 window.location 包含很多当前网页和浏览器的属性，前端可以从这两个参数里获取属性。
window.location
当前网页的域名、协议都能拿到
{ "ancestorOrigins": {}, "href": "https://www.baidu.com/", "origin": "https://www.baidu.com", "protocol": "https:", "host": "www.baidu.com", "hostname": "www.baidu.com", "port": "", "pathname": "/", "search": "", "hash": "" }
window
复制不出来，这里就贴两张截图了
