W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form id="myForm"> 单选按钮：<input type="radio" id="myRadio"> </form> <p>请点击“试一试”按钮，显示单选按钮所属表单的 id。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myRadio").form.id; document.getElementById("demo").innerHTML = x; } </script> </body> </html>