<html> <body> <form id="form1"> <input type="radio" id="radio1" /> </form> <p>The id of the form containing the radio button is: <script type="text/javascript"> x=document.getElementById('radio1'); document.write(x.form.id); </script></p> </body> </html>
结果:
编辑上面的代码，点击查看结果。
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