<html>
<script type="text/javascript">
function jc(){document.form1.textfield.value = "456";
document.form1.textarea.value = "78979898798789756446"; //在这里
return false;
}</script>
</head>
<body>
<form id="admin" name="form1" method="post" action="" οnsubmit="return jc()"> <p> <input type="text" name="textfield" id="textfield" /> </p> <p> <textarea name="textarea" id="textarea" cols="45" rows="5"></textarea> </p> <p> </p> <p> <input type="submit" name="button" id="button" value="提交" /> </p></form></body></html>