代码示例:(标识:jsck_element_removeattributenode_1)
<!DOCTYPE html>
<html>
<style>
.democlass {
  color: red;
}
</style>

<body>

<h1 class="democlass">Element 对象</h1>

<h2>removeAttributeNode() 方法</h2>

<p>单击“删除”可从第一个 h1 元素中删除 class 属性节点。</p>

<button onclick="myFunction()">class</button>

<script>
function myFunction() {
  const element = document.getElementsByTagName("H1")[0];
  const attr = element.getAttributeNode("class");
  element.removeAttributeNode(attr);
}
</script>

</body>
</html>
运行结果: