home.html

<view class="home-banner">
    <swiper indicator-dots="ture" indicator-color="#ff0000" autoplay="true" interval="3500" circular="true">
    <block wx:for="{{bannerList}}" wx:key="_id">
      <swiper-item>
        <image src="{{item.imgUrl}}" class="home-banner_img" ></image>
      </swiper-item>
    </block>
    </swiper>
  </view>

home.js

 // 获取轮播的数据
  getBanner: function() {
    // orderBy排序，desc以降序方式，limit限制请求多少个
    db.collection('emall').orderBy('count','desc').limit(4).get({
      success: res => {
        this.setData({
          bannerList: res.data
        })
      }
    })
  },
onLoad: function (options) {
    this.getBanner()
  }

当点击详情页时，进行访问量加一 detail.js

   */
  onLoad: function (options) {
    this.setData({
      ig: options,
      goodList: []
    })
    // 获取当前某个商品的数据
    const ins = db.collection('emall').doc(options.id)
    // 记录访问量 db.command.inc()每次自增多少，自己定义
    ins.update({
      data: {
        count: db.command.inc(1)
      }
    })
    ins.get({
      success: res => {
        console.log(res)
        this.setData({
          goodList: res.data
        })
      }
    })
  },