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<!DOCTYPE html> <html> <body> <p id="myP">我是一个段落。</p> <p>单击按钮获取 p 元素的 HTML 内容。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myP").innerHTML; document.getElementById("demo").innerHTML = x; } </script> </body> </html>