<div class="span12" id="test" style="width: 810px;">
        <ul class="nav nav-tabs">
            <li class="active"><a href="/#tab1" data-toggle="tab">New Stream</a></li>
            <li><a id="addspan" href="/#C" data-toggle="tab">+</a></li>
        </ul>
        <div class="tabbable">
            <div class="tab-content" id="tabContent">
                <div class="tab-pane active" id="tab1">
                    @Html.Partial("_NewStreamPartial",Model)
                </div>

            </div>
        </div>
    </div>

这是我的javascript

<script type="text/javascript">
    $(function () {
        var count = 2;
        $('#addspan').click(function () {
            var Id = $('.tab-pane active').attr('id');

          });
    });
</script>

我想得到Div Id谁的班级名称“.tab-pane active”(意味着我想获得活跃的Div Id)我怎么能这样做？