微信小程序wx.previewImage预览图片

<scroll-view  scroll-y="true">
      <swiper  catchtap="onSwiperTap" autoplay="auto" interval="3000" duration="500" current="{{swiperCurrent}}"  bindchange="swiperChange">
          <block wx:for="{{home_pics}}" wx:for-item="image"   wx:for-index="index">
              <swiper-item>
        <image src="{{image}}" data-src="{{image}}" bindtap="previewImage"></image>
              </swiper-item>
          </block>
      </swiper>

<span style="font-family:Comic Sans MS;font-size:18px;color:#333333;">.container {
    box-sizing:border-box;
    padding:20px;
} 
.previewimg{
    float:left;
    width:45%;
    height:200px;
    margin:2%;
}
.previewimg image{
    width:100%;
    height:100%;
}</span>

var app = getApp()  
Page({
    data: {  
       imgalist:[ 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1496287851&di=0a26048f586b8521
       93cb5026d60c4fad&imgtype=jpg&er=1&src=http%3A%2F%2Fpic.58pic.com%2F58pic%2F12%2F74%2F05%2F99C58PICYck.jpg',
       'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1495693185413&di=0d0acdebf0f532edd0fcdb7
       6265623c5&imgtype=0&src=http%3A%2F%2Fimg1.3lian.com%2Fimg013%2Fv3%2F2%2Fd%2F61.jpg', 
    ]},
    /** 
     * 预览图片
     */
    previewImage: function (e) {  
        var current=e.target.dataset.src;
        wx.previewImage({
              current: current, // 当前显示图片的http链接
              urls: this.data.imgalist // 需要预览的图片http链接列表
        })
    }  
})