在value设置,切记在value设置
<picker-view bindchange="bindintWeightChange"
indicator-style="height: 50px;"
style="width: 100%; height: 120px;"
value="{{idxIntWeight}}"
class="margin">
<picker-view-column>
<view wx:for="{{weightArray}}"
wx:key="{{index}}"
style="line-height: 50px">{{weightArray[index]+30}}</view>
</picker-view-column>
</picker-view>