try<script language="javascript">
function CopyValue()
{
var txtObj = document.frmtest.mytxt;
var range= txtObj.createTextRange();
range.moveEnd("character",txtObj.value.length);
range.select();
document.execCommand("Copy");
range.moveStart("character",txtObj.value.length);
range.select();
}
</script>
<form name="frmtest">
<textarea name="mytxt" rows="4" cols="20"></textarea><br>
<input type="button" value="copy" onclick="CopyValue()">
</form>
function CopyValue()
{
var txtObj = document.frmtest.mytxt;
var range= txtObj.createTextRange();
range.moveEnd("character",txtObj.value.length);
range.select();
document.execCommand("Copy");
range.moveStart("character",txtObj.value.length);
range.select();
}
</script>
<form name="frmtest">
<textarea name="mytxt" rows="4" cols="20"></textarea><br>
<input type="button" value="copy" onclick="CopyValue()">
</form>
谢谢,但我想使用的域是隐藏的,不知可以这样操作吗?