imageLoad: function (e) {

var _this = this;

var imgWidth = (1-0.06)*wx.getSystemInfoSync().windowWidth;

var originWidth = e.detail.width;

var originHeight = e.detail.height;

var imgHeight = imgWidth * originHeight / originWidth;

_this.setData({

  height: parseInt(imgHeight)

})

},

<swiper style="height: {{ height }}px;" autoplay="{{autoplay}}" interval="{{interval}}" duration="{{duration}}" circular="{{ circular }}" bindchange="swiperchange">

<block>

<block wx:for="{{ banner }}" wx:key="*this">

<swiper-item>

<view class="swiper-item">

<image bindload='imageLoad' src="{{ item.image }}" mode="widthFix" style="width: 100%;" ></image>

</view>

</swiper-item>

</block>

</block>

</swiper>