<view>
 <button bindtap="previewImage" type="primary">圖片上傳預覽</button>
 <view class="tui-content"> 
 <image class="tui-preview-img" wx:for="{{previewImageArr}}" bindtap="changePreview" data-src="{{item}}" src="{{item}}"></image>
 </view>
</view>

page{background-color: #efeff4;}
.tui-preview-img{
 width: 200rpx;
 height: 120rpx;
}

Page({
 data: {
 previewImageArr:[]
 },
 previewImage(e){
 var self = this;
 wx.chooseImage({
 count:8,
 success(res) {
 var tempFilePaths = res.tempFilePaths;
 self.setData({ previewImageArr: tempFilePaths});
 }
 })
 },
 changePreview(e){
 var self = this;
 wx.previewImage({
 current: e.currentTarget.dataset.src,
 urls: self.data.previewImageArr
 })
 }
})