$(document).ready(function () {

    //全选checkbox

    $("#selectAll").click(function () {

        var checked = $(this).prop("checked");

        $(":checkbox").prop("checked", checked);

    });

    $("tbody :checkbox").click(function () {

        var isAllSelected = $("#selectAll").prop("checked");

        var selected = $(this).prop("checked");

        if (!selected ) {

            $("#selectAll").prop("checked", false);

        } else {

            isAllSelected = true;

            $("tbody :checkbox").each(function () {

                if (!$(this).prop("checked")) {

                    isAllSelected = false;

                    return false;

                }

            });

            $("#selectAll").prop("checked", isAllSelected);

        }

    });

});