<html><body><h1>Element 对象</h1><h2>outerHTML 属性</h2><p id="myP">我是一个段落！单击“更改”可用标题替换我。</p><button onclick="myFunction()">更改</button><script>function myFunction() { const element = document.getElementById("myP"); element.outerHTML = "<h2>This is a h2 element.</h2>";}</script></body></html>