<div class="page-header">
<div class="form-horizontal">
<div class="control-label col-lg-0">
</div>
<div class="col-lg-2">
<select class="form-control" onchange="selectOnchang(this)">
<option>男装</option>
<option>女装</option>
<option>童装</option>
<option已通过审核商家</option>
</select>
</div>
</div>

function selectOnchang(obj){ 
//获取被选中的option标签选项 
alert(obj.selectedIndex);
}

<div class="page-header">
<div class="form-horizontal">
<div class="control-label col-lg-0">
</div>
<div class="col-lg-2">
<select class="form-control" onchange="selectOnchang(this)">
<option value="men">男装</option>
<option value="wemen">女装</option>
<option value="childe">童装</option>
<option value="yunfu">孕妇装</option>
</select>
</div>
</div>

function selectOnchang(obj){ 
var value = obj.options[obj.selectedIndex].value;
alert(value);
}