W3School TIY Editor
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<!DOCTYPE html> <html> <body> <h1>演示如何访问单选按钮</h1> 单选按钮：<input type="radio" id="myRadio"> <p>点击“试一试”按钮可勾选单选按钮。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myRadio"); x.checked = true; } </script> </body> </html>