避免表单多次提交

1：提交后将Submit按钮设为Disable

<div id="SpecialBrokerageEdit">
    @using (Html.BeginForm("AddSpecialBrokerage", "BrokerageStandard", FormMethod.Post, new { id = "frmSpecialBrokerageEdit" }))
    {
        @Html.HiddenFor(m => m.SpBrokerageStdId)
        @Html.HiddenFor(m => m.SpecialBrokerageId)
             <table>
            <tr>
                <td>@Html.LabelFor(m => m.SpSiteId)</td>
                <td>
                    @Html.TextBoxFor(m => m.SpSiteId)
                    @Html.ValidationMessageFor(m => m.SpSiteId)
                </td>
            </tr>
              <tr>
                <td>
                    <label>佣金分配：</label>
                </td>               
            </tr>
            <tr>
                <td>@Html.LabelFor(m => m.SpMediaPercent)</td>
                <td>
                    @Html.TextBoxFor(m => m.SpMediaPercent)<label  name="SpPercentTypeLog">元</label>
                    @Html.ValidationMessageFor(m => m.SpMediaPercent)
                </td>
            </tr>
            <tr>
                <td>@Html.LabelFor(m => m.SpPlatformPercent)</td>
                <td>
                    @Html.TextBoxFor(m => m.SpPlatformPercent)<label name="SpPercentTypeLog">元</label>
                    @Html.ValidationMessageFor(m => m.SpPlatformPercent)
                </td>
            </tr>
        </table>
        <div class="buttoncontainer">
            <input style="50px;height:30px;" type="submit" value="确定" id="btnspecialBrokerageSave" />
            <input style="50px;height:30px;" type="button" value="取消" id="btnspecialBrokerageCancel" />
        </div>
    }
</div>

    var options = {
        beforeSubmit: function () {
            var itemBtn = $("#btnspecialBrokerageSave");
            itemBtn.prop("disabled", "disabled");
            setTimeout(function () {
                itemBtn.removeAttr("disabled");
            }, 2000);
            return false;
        },
        success: function (data) {
            if (data.Status == 1) {
                info.btnSearchSpecialBrokerage.click();
                infoSpecial.btnspecialBrokerageCancel.click();
            } else {
                alert(data.Message);
            }
        }
    };
    $('#frmSpecialBrokerageEdit').ajaxForm(options);