<input type="text" name="color">
<input type="button" value="check" onclick="checkColor('color')">
检查一下颜色值 ,正确是#+六位十六进制数
比如:#3EEF4A

<script language="JavaScript">
function checkColor(object)
{
var pattern = /^#[0-9a-fA-F]{6}$/
var obj = eval（"document.all['" + object + "'].value") ;
if(obj.match(pattern)==null)
alert("错误") ;
else
alert("正确") ;
}
</script>