小程序图片上传，长按删除,weui

<view class="weui-cells">

  <view class="weui-cell">

    <view class="weui-cell__bd">

      <view class="weui-uploader">

        <view class="weui-uploader__hd">

          <view class="weui-uploader__title">图片上传</view>

          <view class="weui-uploader__info">{{files.length}} / </view>

        </view>

        <view class="weui-uploader__bd">

          <view class="weui-uploader__files" id="uploaderFiles">

            <block wx:for="{{files}}" wx:key="*this">

              <view class="weui-uploader__file" bindtap="previewImage" bindlongpress="deleteImage" id="{{item}}" data-index="{{index}}">

                <image class="weui-uploader__img" src="{{item}}" mode="aspectFill"/>

              </view>

            </block>

          </view>

          <view wx:if="{{files.length < 9}}" class="weui-uploader__input-box" >

            <view class="weui-uploader__input" bindtap="chooseImage"></view>

          </view>

        </view>

      </view>

    </view>

  </view>
</view>

Page({
  data: {
    files: []
  },
  chooseImage: function(e) {
    var that = this;    var images = that.data.files;
    wx.chooseImage({
      count:  - images.length,
      sizeType: ['original', 'compressed'],
      sourceType: ['album', 'camera'],
      success: function(res) {
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
        that.setData({
          files: that.data.files.concat(res.tempFilePaths)
        });
      }
    })
  },
  previewImage: function(e) {
    wx.previewImage({
      current: e.currentTarget.id,
      urls: this.data.files
    })
  },
  deleteImage: function(e) {
    var that = this;    var images = that.data.files;    var index = e.currentTarget.dataset.index; //获取当前长按图片下标
    wx.showModal({
      title: '系统提醒',
      content: '确定要删除此图片吗？',
      success: function(res) {
        if (res.confirm) {
          images.splice(index, );
        } else if (res.cancel) {
            return false;
        }
        that.setData(
          files: images
        });
      }
    })
  }
})