<select name="aaa">
<option value='a'></option>
<option value='b'></option>
<option value='c'></option>
</select>
<input type="button" value="变换" onclick="aaa.option[0].value='d';aaa.option[0].value='e';aaa.option[0].value='f';">
<option value='a'></option>
<option value='b'></option>
<option value='c'></option>
</select>
<input type="button" value="变换" onclick="aaa.option[0].value='d';aaa.option[0].value='e';aaa.option[0].value='f';">
<head>
<meta name="GENERATOR" Content="Microsoft Visual Studio.NET 7.0">
<link href="/css/table.css" rel="stylesheet" type="text/css">
<script language=javascript>
<!--
function typechange()
{
var x=document.total_input.aa.value;
//alert(x);
switch(x)
{
case '1':
var arry=["1","2","3"];break;
case '2':
var arry=["a","b","c"];break;
case '3':
var arry=["d","e","f"];break;
}
document.total_input.bb.options.length = 0;
for (j=0;j<arry.length;j++)
document.total_input.bb.options.add(new Option(arry[j],j))
}
//-->
</script></head>
<body bgcolor="#CCCCCC">
<form name ="total_input">
<select name="aa" onchange="typechange()">
<option value=1 selected>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<select name="bb"></select>
</form>
</body>
</html>
<option value='a'>a</option>
<option value='b'>b</option>
<option value='c'>c</option>
</select>
<input type="button" value="变换" onclick="aaa.options[0].value='d';aaa.options[0].innerText='d';aaa.options[1].value='e';aaa.options[1].innerText='e';aaa.options[2].value='f';aaa.options[2].innerText='f';">
<option value='a'>a</option>
<option value='b'>b</option>
<option value='c'>c</option>
</select>
<input type="button" value="变换" onclick="aaa.options[0].value='d';aaa.options[0].innerText='d';aaa.options[1].value='e';aaa.options[1].innerText='e';aaa.options[2].value='f';aaa.options[2].innerText='f';">