W3School TIY Editor
W3School 在线教程
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暗黑模式
运行代码
<html> <body> <form id="form1"> <input type="text" id="text1" /> </form> <p>The id of the form containing the text field is: <script type="text/javascript"> x=document.getElementById('text1'); document.write(x.form.id); </script></p> </body> </html>