[mini-blog]小程序最近两个迭代版本总结，来看看更新了哪些内容吧

  /**
   * towxml点击事件
   * @param {} e 
   */
  __bind_tap: function (e) {
    try {
      if (e.target.dataset._el.attr.src != undefined) {
        wx.previewImage({
          urls: [e.target.dataset._el.attr.src],
        });
      }
    }
    catch (e) {
      console.info(e)
    }
  },

<view wx:if="{{showBanner}}" class="cu-item">
  <view class="content padding-right-xs padding-left-xs">
    <ad binderror="adError" bindclose="adClose" unit-id="adunit-9b6188843da06444"></ad>
  </view>
</view>

  adError(err) {
    console.log('Banner 广告加载失败', err)
    this.setData({
      showBanner:false
    })
  },
  adClose() {
    console.log('Banner 广告关闭')
    this.setData({
      showBanner:false
    })
  }

/**
 * 获取所有专题集合
 * @param {*} event 
 */
async function getClassifyList(event) {
  const MAX_LIMIT = 100
  const countResult = await db.collection('mini_config').where({
    key: 'basePostsClassify'
  }).count()
  const total = countResult.total
  if (total === 0) {
    return {
      data: [],
      errMsg: "no classify data",
    }
  }
  // 计算需分几次取
  const batchTimes = Math.ceil(total / 100)
  // 承载所有读操作的 promise 的数组
  const tasks = []
  for (let i = 0; i < batchTimes; i++) {
    const promise = db.collection('mini_config').where({
      key: 'basePostsClassify'
    }).skip(i * MAX_LIMIT).limit(MAX_LIMIT).get()
    tasks.push(promise)
  }
  // 等待所有
  return (await Promise.all(tasks)).reduce((acc, cur) => {
    return {
      data: acc.data.concat(cur.data),
      errMsg: acc.errMsg,
    }
  })
}