MVC4 批量删除数据

JQuery代码：

<script type="text/javascript">
    $(document).ready(function () {
        // 全选
        $("#selectAll").click(function () {
            $("input[name='RKEY']").prop("checked", this.checked);
        });
        // 单选
        var subChk = $("input[name='RKEY']")
        subChk.click(function () {
            $("#selectAll").prop("checked", subChk.length == subChk.filter(":checked").length ? true : false);
        });
        /* 批量删除 */
        $("#deleteBtn").click(function () {
            // 判断是否至少选择一项
            var checkedNum = $("input[name='RKEY']:checked").length;
            if (checkedNum == 0) {
                alert("至少选择一项！");
                return;
            }

            // 批量选择
            if (confirm("确定要删除所选项目？")) {
                var checkedList = new Array();
                $("input[name='RKEY']:checked").each(function () {
                    checkedList.push($(this).val());
                });
                $.ajax({
                    type: "POST",