innerHeight 和 innerWidth
这两个方法分别是用来获取浏览器窗口的宽度和高度（包含滚动条的）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
body,html{
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<script>
console.log(window.innerHeight,innerHeight)
console.log(window.innerWidth,innerWidth)
</script>
</body>
</html>