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<!DOCTYPE html> <html> <body> <form> First Name: <input type="text" name="fname" value="Donald"><br> Last Name: <input type="text" name="lname" value="Duck"> </form> <p>单击该按钮可显示文档中表单元素的数量。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.forms.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>