day43 操作bom对象，dom对象

操作bom对象

bom：浏览器对象模型

window对象代表浏览器窗口

//window.alert(22)
 window.innerHeight
 //595
 window.innerWidth
 //131
 window.innerWidth
 //322
 window.outerHeight
 //824
 window.outerWidth
 //1536

Navigator

//Navigator封装了浏览器信息
 navigator.appVersion
 //'5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36'
 navigator.platform
 //'Win32'

//不建议使用navigator属性判断和编写代码

screen

 //screen代表屏幕尺寸
 screen.width
 //1536
 screen.height
 //864

location 代表当前页面的url信息

 /*
 host:"www.baidu.com"
 hostname:"www.baidu.com"
 href:"https://www.baidu.com/"
 protocol: "https:"
 reload: reload()//刷新网页
 */
 
 //跳转至其他网页
 location.assign('http://www.bilibili.com')

其他

 //document代表当前的页面，html dom文档树
 document.title
 //'百度一下，你就知道'
 
 
 //获取cookie
 document.cookie
 //'BIDUPSID=33C2B248AF50BA4D1532930E18F354D1; PSTM=1607833850; BAIDUID=857915D13671CA35E7044F3C1DBD4953:FG=1; BAIDUID_BFESS=857915D13671CA35E7044F3C1DBD4953:FG=1; ZFY=1KJ7uzmcLFByZ:A2fasn:Aaq5bnVHNZfWqnrA9SkAWql0:C; baikeVisitId=a2e509a7-59f6-4f0a-afab-df4491f9c721; BD_HOME=1; H_PS_PSSID=37856_36555_37733_37767_37625_37766_37866_36802_37761_37850_26350_22159; BD_UPN=12314753; BA_HECTOR=a08ga0al0184a1ag20a08mik1hogpp61h'
 
 
 //history 代表浏览器的历史记录
 history.back()
 history.forward()

操作dom对象

浏览器就是一个dom树型结构

 //更新：更新dom节点
 //删除：删除dom节点
 //添加：添加一个新的dom节点
 
 document.getElementsByTagName('h1')
 document.getElementById('p1')
 document.getElementsByClassName('p2')
 var father = document.getElementById('father')
 var children = father.children//获取父节点下的所有子节点