js不知道怎么写
<view class="selnum" > <view data-item-index="{{index}}" class="cut" catchtap="cutNumber">-</view> <input value="{{item.number}}" class="number" disabled="true" type="number" /> <view data-item-index="{{index}}" class="add" catchtap="addNumber" disabled='{{disabled}}'>+</view></view>
https://vant-contrib.gitee.io/vant-weapp/#/stepper