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<!-- index.wxml -->
<view class="container">
  <view class="count">{{count}}</view>
  <button class="button" bindtap="increment">+</button>
  <button class="button" bindtap="decrement">-</button>
</view>

// index.js
Page({
  data: {
    count: 0
  },
  increment: function() {
    this.setData({
      count: this.data.count + 1
    })
  },
  decrement: function() {
    this.setData({
      count: this.data.count - 1
    })
  }
})