微信小程序云开发数据库操作更新记录

<!-- 更新记录 -->
  <view class="guide" wx:if="{{step === 5}}">
    <text class="headline">更新记录</text>
    <text class="p">1. 打开 pages/databaseGuide/databaseGuide.js 文件，定位到 onCounterInc 和 onCounterDec 方法</text>
    <text class="p">2. 把注释掉的代码解除注释</text>
    <image class="code-image" src="../../images/code-db-inc-dec.png" mode="aspectFit"></image>
    <text class="p">3. 点击下方按钮更新计数器</text>
    <div class="counter">
      <button class="minus" size="mini" type="default" bindtap="onCounterDec">-</button>
      <text class="p">{{count}}</text>
      <button class="plus" size="mini" type="default" bindtap="onCounterInc">+</button>
    </div>

    <div class="nav">
      <button class="prev" size="mini" type="default" bindtap="prevStep">上一步</button>
      <button class="next" size="mini" type="default" bindtap="nextStep">下一步</button>
    </div>
  </view>

<div class="counter">
      <button class="minus" size="mini" type="default" bindtap="onCounterDec">-</button>
      <text class="p">{{count}}</text>
      <button class="plus" size="mini" type="default" bindtap="onCounterInc">+</button>
</div>

// pages/databaseGuide/databaseGuide.js
const app = getApp()
Page({

  data: {
    step: 1,
    counterId: '',
    openid: '',
    count: null,
    queryResult: '',
  },

  onLoad: function (options) {
    if (app.globalData.openid) {
      this.setData({
        openid: app.globalData.openid
      })
    }
  },

  onCounterInc: function() {
    const db = wx.cloud.database()
    const newCount = this.data.count + 1
    db.collection('counters').doc(this.data.counterId).update({
      data: {
        count: newCount
      },
      success: res => {
        this.setData({
          count: newCount
        })
      },
      fail: err => {
        icon: 'none',
        console.error('[数据库] [更新记录] 失败：', err)
      }
    })
  },

  onCounterDec: function() {
    const db = wx.cloud.database()
    const newCount = this.data.count - 1
    db.collection('counters').doc(this.data.counterId).update({
      data: {
        count: newCount
      },
      success: res => {
        this.setData({
          count: newCount
        })
      },
      fail: err => {
        icon: 'none',
        console.error('[数据库] [更新记录] 失败：', err)
      }
    })
  },
})