<div class="form_class">
<select name="test">
<option value="0">请选择</option>
<option value="1">订单</option>
<option value="2">商品</option>
</select>
</div>
1, obtaining the value of the selected item value
$ ( "form_class select [name = 'test'].") Val ().;
2, select own designated below Option
$ ( "select form_class [name = 'Test'].") Val (1); \\ 0:. Please select 1: Order 2: Product