<image class="img1" 
    :class="[{‘img1‘:index == 0},{‘img2‘:index == 1},{‘img3‘:index == 2}]"
    :src="avtUrl" 
    lazy-load="true"
    mode="aspectFill"
    v-for="(avtUrl, index) in imgList.UserImgList"
    :key="index">
</image>