​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>Element 对象</h1>
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<h2>insertAdjacentElement() 方法</h2>
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<button onclick="myFunction()">移动</button>
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<p>单击“移动”可将红色 span 插入标题内。</p>
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<span id="mySpan" style="color:red">我的 span</span>
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<h2 id="myH2">我的 Header</h2>
​
<script>
function myFunction() {
  const span = document.getElementById("mySpan");
  const h2 = document.getElementById("myH2");
  h2.insertAdjacentElement("beforeend", span);
}
</script>
​
</body>
</html>
​