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<!DOCTYPE html> <html> <body> <h3>如何访问输入按钮的演示</h3> <p>单击按钮以获取显示在按钮上的文本。</p> <input type="button" id="myBtn" onclick="myFunction()" value="Try it"> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myBtn").value; document.getElementById("demo").innerHTML = x; } </script> </body> </html>