html运行实例（jsck_node_insertadjacenttext

代码示例：（标识：jsck_node_insertadjacenttext_3）

<!DOCTYPE html>
<html>
<body>

<h1>Element 对象</h1>

<h2>insertAdjacentText() 方法</h2>

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

<p>单击“插入”可在标题前插入一些文本：</p>

<h2 id="myH2">我的标题</h2>

<script>
function myFunction() {
  const h2 = document.getElementById("myH2");
  let text = "My inserted text";
  h2.insertAdjacentText("beforebegin", text);
}
</script>

</body>
</html>