<view class='pz'  wx:for="{{pz}}" wx:for-index='xb' wx:for-item='value' >

<image src='../../images/{{value.img}}.jpg'></image>

{{value.name}} {{value._id}}

<!--商品数量减少 -->

<view  class="{{open?'display_showv':'display_none'}}" bindtap='subtract' data-img='{{value.img}}' data-amount='{{amount}}' data-price='{{value.price}}' data-name='{{value.name}}'>

-

</view>

<text class='bb'>你好</text>

<!--商品数量增加 -->

<view bindtap='add' id='aa' data-amount='{{amount}}' data-price='{{value.price}}' data-name='{{value.name}}' data-img='{{value.img}}'>

+

</view>

</view>

wx.createSelectorQuery().select('.bb') 用这个不行