<!DOCTYPE html>
<html>
<body>
<h1>Element 对象</h1>
<h2>nodeType 属性</h2>
<p>body 元素的节点类型是：</p>
<p id="demo"></p>
<script>
let type = document.body.nodeType;
document.getElementById("demo").innerHTML = type;
</script>
</body>
</html>