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<!DOCTYPE html> <html> <body> <h3>如何访问 BUTTON 元素的演示</h3> <p>单击以禁用 BUTTON 元素：</p> <button type="button" id="myBtn" onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myBtn"); x.disabled = true; } </script> </body> </html>