微信小程序swiper高度自適應(yīng)

<view class='swiper'>
    <swiper indicator-dots="{{indicatorDots}}" vertical="{{vertical}}" autoplay="{{autoplay}}" duration="{{duration}}" interval='{{interval}}' bindchange="bindchange"  circular="{{circular}}" style="height:{{imgheights[current]}}rpx;">
    <block wx:for='{{imgList}}' wx:key="{{index}}">
      <swiper-item>
        <image src="{{item}}" data-id='{{index}}' class="slide-image" mode="widthFix" bindload="imageLoad"/>
      </swiper-item>
      </block>
    </swiper>
  </view>

.swiper image {
  width: 100%;
  height: auto;
}

data: {
    //圖片地址
    imgList: ['/images/wyh-img_bg.png', '/images/wyh-img8.png', '/images/wyh-img_shop1.png', '/images/wyh-img_bg1.png'],
    //是否采用銜接滑動  
    circular: true,
    //是否顯示畫板指示點  
    indicatorDots: false,
    //選中點的顏色  
    indicatorcolor: "#000",
    //是否豎直  
    vertical: false,
    //是否自動切換  
    autoplay: true,
    //自動切換的間隔
    interval: 2500,
    //滑動動畫時長毫秒  
    duration: 100,
　　
    //所有圖片的高度  （必須）
    imgheights: [],
    //圖片寬度 
    imgwidth: 750,
    //默認(rèn)  （必須）
    current: 0   
  },
imageLoad: function (e) {//獲取圖片真實寬度  
    var imgwidth = e.detail.width,
      imgheight = e.detail.height,
      //寬高比  
      ratio = imgwidth / imgheight;
      console.log(imgwidth, imgheight)
    //計算的高度值  
    var viewHeight = 750 / ratio;
    var imgheight = viewHeight;
    var imgheights = this.data.imgheights;
    //把每一張圖片的對應(yīng)的高度記錄到數(shù)組里  
    imgheights[e.target.dataset.id] = imgheight;
    this.setData({
      imgheights: imgheights
    })
  },
  bindchange: function (e) {
    // console.log(e.detail.current)
    this.setData({ current: e.detail.current })
  },