官方文档解读:
<!-- 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>
wxml:
<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>
js:
// 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)
}
})
},
})
效果如下:
原文作者:祈澈姑娘
技术博客:https://www.jianshu.com/u/05f416aefbe1
90后前端妹子,爱编程,爱运营,爱折腾。
坚持总结工作中遇到的技术问题,坚持记录工作中所所思所见,欢迎大家加入群聊,一起探讨交流。
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