W3School TIY
编辑您的代码：
<html> <body> <form> <input type="hidden" alt="Hidden field" id="hidden1" /> </form> <p>The alt text for the hidden field is: <script type="text/javascript"> x=document.getElementById('hidden1'); document.write(x.alt); </script></p> </body> </html>
查看结果: