yige.org 试一个

<html>
<body>

<form id="myForm">
Firstname: <input id="fname" type="text" value="Mickey" />
Lastname: <input id="lname" type="text" value="Mouse" />
<input id="sub" type="button" value="Submit" />
</form>

<p>Get the value of all the elements in the form:<br />
<script type="text/javascript">
var x=document.getElementById("myForm");
for (var i=0;i<x.length;i++)
  {
  document.write(x.elements[i].value);
  document.write("<br />");
  document.write(x.elements[i].type);
  document.write("<br />");
  }
</script>
</p>

</body>
</html>

结果:

编辑上面的代码，点击查看结果。

yige.org - 试一个