把按钮放在picker区域里就好了 picker本身就是一个区域
<picker mode = "selector" class='info' bindchange="bindPickerChange" value="{{index_member}}" range="{{members}}" range-key="name">
//下面可以是图片或按钮
<image class="state" src="../../assets/images/tast.png"></image>
</picker>