AJAX调用不将值传递给操作

I have a View that contains:

我的观点包括:

(...)

<div id="txtMan@(item.ManufacturerId)" hidden>
    @Html.TextBoxFor(modelItem => item.ManufacturerName, new { @id = "txtBoxMan"+item.ManufacturerId })
</div>
<td>
    <input class="btnSave" id="btnSave@(item.ManufacturerId)" type="button" value="Save" onclick="saveButtonPressed(@item.ManufacturerId);" hidden />
</td>

(...)
(...)