微信小程序 图片宽度自适应的实现

<swiper indicator-dots="{{indicatorDots}}" autoplay="{{autoplay}}" interval="{{interval}}" duration="{{duration}}">   <block wx:for="{{imgUrls}}" wx:key="image">    <swiper-item>      <image src="{{item.image}}" model="aspectFit" style="width: {{imageWidth}}px;" bindload="imageLoad" />    </swiper-item>   </block> </swiper>  

imageLoad: function () {   this.setData({    imageWidth: wx.getSystemInfoSync().windowWidth,//图片宽度     imgUrls: [      { image: "http://img02.tooopen.com/images/20150928/tooopen_sy_143912755726.jpg" },    { image: "http://img06.tooopen.com/images/20160818/tooopen_sy_175866434296.jpg" },    { image: "http://img06.tooopen.com/images/20160818/tooopen_sy_175833047715.jpg" }],    indicatorDots: false,//是否显示圆点   autoplay: true,//自动播放   interval: 2000,//间隔时间   duration: 1000//监听滚动和点击事件  }) }