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<!DOCTYPE html>
<html>
<body>
<h1>获取父级 HTML 元素</h1>
<h2 id="01">Hello World!</h2>
<h2 id="02">Hello China!</h2>
<h2 id="03">Hello Shanghai!</h2>
<p id="demo"></p>
<script>
var myParent = document.getElementById("02").parentNode;
document.getElementById("demo").innerHTML = myParent.nodeName;
</script>
</body>
</html>