01 BOM对象介绍
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<!-- 浏览器对象模型 BOM -->
<!--
1.window
alert()
confirm()
prompt()
setInterval()
setTimeout()
2.location
href
hash
url
reload
3.screen
4.history
go()
-->
</body>
</html>