提交?表单提交吗?
<script>
function check()
{
if (XXX==OOO){alert("");return false}
}
</script><form onsubmit="return check()" action="">
</form>
<script>
function check()
{
if (XXX==OOO){alert("");return false}
}
</script><form onsubmit="return check()" action="">
</form>
<input type=text id=yy value="dddff">
session.setAttribute("Text_yy",yy.value);
response.sendRedirect("yy.php");