最近一个月都磕在了wx.uploadfile 上传图片上边。问同学同学也都没做过，找资料也一直找不到对症的。实在不知道问题出在哪了。希望哪位小哥哥小姐姐有空的话帮忙给看看，讲一下我到底该怎么改，谢谢啦！

  wxml代码

<view class='photo'>

    <view class='photo-up'>

            <button class="upload-img-btn"type='primary' bindtap="chooseImg" >选择图片</button>

    </view>

    <view class="img-v">

            <view class="img" wx:for="{{imgs}}" wx:for-item="item" wx:key="*this">

                    <image class='img-s' src="{{item}}" data-index="{{index}}" mode="aspectFill" bindtap="previewImg"></image>

            </view>

    </view>

    <button class="delete-btn" data-index="{{index}}" type='primary' catchtap="deleteImg">删除图片</button>

</view>

这段代码中，一直不是很明白 <view class="img" wx:for="{{imgs}}" wx:for-item="item" wx:key="*this">   这一句的详细意思。

wxss代码

.photo{justify-content: flex-start;}

.upload-img-btn{line-height: 30px;margin-left: 0px;margin-top: 10px}

.delete-btn{line-height: 30px;margin-left: 0px;margin-top: 0px}

.img-v{display: flex;flex-flow: row ;margin-top: 10px;}

.img-s{width:150rpx;height:150rpx;margin-left: 5px}

js代码

chooseImg: function (e) {

    var that = this;

    var imgs = this.data.imgs;

    if (imgs.length >= 4) {

    this.setData({

    lenMore: 1

    });

    setTimeout(function () {

    that.setData({

    lenMore: 0

    });

    },