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>
