<option>==</option>
<option>1</option>
<option>2</option>你的OPTION根本没有VALUE,哪来的值
<option>==</option>
<option value=1>1</option>
<option value=2>2</option>
<option>1</option>
<option>2</option>你的OPTION根本没有VALUE,哪来的值
<option>==</option>
<option value=1>1</option>
<option value=2>2</option>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<script language="JavaScript">
function ok()
{
var a = document.form1.D1.options[document.form1.D1.selectedIndex].text
alert(a);
if (a==1){
document.form1.textfield.value= "234234"
//document.form1.textfield.value;
}
}
</script><form name="form1" method="post" action="">
<select size="1" name="D1" onchange="ok()">
<option>==</option>
<option>1</option>
<option>2</option>
</select>
<p>
<input type="button" name="Submit1" value="1--------->2" onClick="ok()">
<input type="text" name="textfield"></p>
</form></body>
</html>