编辑下面的代码:【加编码】
<html> <body> <form id="frm1" action="demo-form.php"> First name: <input type="text" name="fname" value="Donald"><br> Last name: <input type="text" name="lname" value="Duck"><br> <input type="submit" value="Submit"> </form> <p>The number of elements in "frm1" are: <script> document.write(document.getElementById("frm1").length); </script> </p> </body> </html>
结果: 【此窗口】 帮助?
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