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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <h1>outerHTML</h1> <p>单击按钮将标题从 h1 更改为 h3。</p> <button onclick="myFunction()">Change Header</button> <script> function myFunction() { var x = document.getElementsByTagName("h1")[0]; x.outerHTML = "<h3>您更改了整个标题元素及其内容！</h3>"; } </script> </body> </html>