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<!DOCTYPE html> <html> <body> <h1>Get outerHTML</h1> <p>单击按钮以提醒 h1 元素的外部 HTML：</p> <button onclick="myFunction()">警报标题</button> <script> function myFunction() { var x = document.getElementsByTagName("h1")[0]; alert(x.outerHTML); } </script> </body> </html>