fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <form id="myForm"> <label id="myLabel" for="male">Male</label> <input type="radio" name="sex" id="male" value="male"><br> </form> <p>点击“尝试一下”按钮返回 label 所属的表单的 id。</p> <p id="demo"></p> <button onclick="myFunction()">尝试一下</button> <script> function myFunction(){ var x = document.getElementById("myLabel").form.id; document.getElementById("demo").innerHTML=x; } </script> </body> </html>
运行结果