html
<!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>获取非常规元素</title>
</head>
<body>
<ul>
<li>111111111</li>
<li>111111111</li>
<li>111111111</li>
<li>111111111</li>
</ul>
<script>
// 获取html
console.log(document.documentElement)
// 获取head
console.log(document.head)
// 获取body
console.log(document.body)
</script>
</body>
</html>在控制台直接打印出来
