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<!DOCTYPE html> <html> <body> <p id="demo">单击按钮用新内容替换此文档。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.open("text/html","replace"); document.write("<h2>学习 HTML DOM 很有趣！</h2>"); document.close(); } </script> </body> </html>