jq实现多选反选

<script type="text/javascript">
    $('input [name="ckball"]').click(function () {
        if ($('input [name="ckball"]').attr("checked", true)) {
            $('input [name="ckb"]').attr("checked", true);
        }
        else {
            $('input [name="ckb"]').attr("checked", false);
        }
    });
   
</script>
//html中有一个name="ckball"和多个name="ckb"的多选框
//<input type="checkbox" name="ckball" />
//<input type="checkbox" name="ckb" />
//<input type="checkbox" name="ckb" />
//<input type="checkbox" name="ckb" />