W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<html> <body> <form id="myForm"> Text: <input type="text" size="20" value="Hello World" /> </form> <script type="text/javascript"> x=document.getElementsByTagName('form')[0]; document.write("Form id: " + x.id); document.write("<br />"); document.write("An alternate way: "); document.write(document.getElementById('myForm').id); </script> </body> </html>