代码示例:(标识:jsck_node_parentelement)
<!DOCTYPE html>
<html>
<body>

<p>Example list:</p>

<ul>
  <li id="myLI">Coffee</li>
  <li>Tea</li>
</ul>

<p>单击该按钮可获取列表中 li 元素的父元素的节点名称。</p>

<button onclick="myFunction()">试一试</button>

<p id="demo"></p>

<script>
function myFunction() {
  var x = document.getElementById("myLI").parentElement.nodeName;
  document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>
运行结果: