W3School TIY
编辑您的代码：
<html> <body> <form id="myForm" method="get"> Name: <input type="text" size="20" value="Peter Griffin" /><br /> Text: <input type="text" size="20" value="Hello World" /> </form> <script type="text/javascript"> document.write("Number of elements in myForm: "); document.write(document.getElementById('myForm').length); </script> </body> </html>
查看结果: