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<!DOCTYPE html> <html> <body> <h3>如何访问单选按钮的演示</h3> 单选按钮：<input type="radio" id="myRadio"> <p>单击“试一试”按钮以选中单选按钮。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myRadio"); x.checked = true; } </script> </body> </html>