2021-01-18微信小程序从接口获取一组图片，image mode模式为widthFix显示后计算最高的图片高度赋值给微信的轮播图组件高度

 <!-- 轮播图 -->
  <view class="tui-banner-bg" wx:if='{{detail.images.length>1}}'>
    <view class="tui-banner-box">
      <swiper indicator-dots="{{true}}" autoplay="{{true}}" interval="{{6000}}" duration="{{250}}" circular="{{true}}"
        indicator-color="rgba(255, 255, 255, 0.8)" indicator-active-color="#fff"
        bindanimationfinish='bindanimationfinish' style="height:{{swiperHeight}}px"
        class="tui-banner-swiper {{isZero?'is_zero':''}}">
        <swiper-item wx:for="{{detail.images}}" wx:key="index" style="display:flex;align-items:center;">
          <image src="{{item}}" class="tui-slide-image" mode="widthFix" bindtap="handelPreview" data-current="{{item}}"
            id='drawID{{index}}' />
        </swiper-item>
      </swiper>
      <view class="abbox">
        <text>{{current+1}}/</text>
        <text>{{detail.images.length}}</text>
      </view>
    </view>
  </view>

 // 计算节点高度
  calcHeight() {
    const len = this.data.len;
    console.log('len', len)
    let idStr = '';
    //选择id
    for (var i = 0; i < len; i++) {
      let id = '#drawID' + i;
      idStr = idStr + id + ','
    }
    this.handelCalcHeight(idStr);

  },
  handelCalcHeight(idStr) {
    var _this = this;
    const heightArr = this.data.heightArr || [];
    const len = this.data.len;
    wx.createSelectorQuery().selectAll(idStr).boundingClientRect().exec(function (res) {
      let isOk = true; //图片渲染完成标志
      //检验是否渲染完成
      res[0].some(item => {
        if (item.height == 0) {
          isOk = false;
          return true;
        }
      })
      //没通过检验
      if (!isOk) {
        setTimeout(() => {
          _this.handelCalcHeight(idStr);
        }, 10);
        return;
      } else {
        //通过检验
        res[0].forEach(item => {
          heightArr.push(item.height);
        })
        _this.setData({
          heightArr
        })
        console.log(heightArr.length == len);
        console.log('heightArr.length', heightArr.length);
        console.log('len', len);

        if (heightArr.length == len) {
          let height = Math.max(...heightArr);
          _this.setData({
            swiperHeight: height == 0 ? '100' : height,
            isZero: false,
          })
        }
        wx.hideLoading();
      }

    })
  },