實現思路：

• 調整頁面，實現展示效果
• 使用wx.chooseImage實現拍照和選擇照片
• 使用wx.previewImage實現圖片預覽
• 使用bindlongpress自定義圖片刪除功能

話不多說，上程式碼：
wxml程式碼

<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">圖片上傳</view>
          <view class="weui-uploader__info">{{files.length}} / 9</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>

js程式碼

Page({
  data: {
    files: []
  },
  chooseImage: function(e) {
    var that = this;
    var images = that.data.files;
    wx.chooseImage({
      count: 9 - images.length,
      sizeType: ['original', 'compressed'],
      sourceType: ['album', 'camera'],
      success: function(res) {
        // 返回選定照片的本地檔案路徑列表，tempFilePath可以作為img標籤的src屬性顯示圖片
        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; //獲取當前長按圖片下標
    wx.showModal({
      title: '系統提醒',
      content: '確定要刪除此圖片嗎？',
      success: function(res) {
        if (res.confirm) {
          images.splice(index, 1);
        } else if (res.cancel) {
          return false;
        }
        that.setData({
          files: images
        });
      }
    })
  }
})

下面沒有了，以上就是實現的全部程式碼！！ 附上微信小程式官方教程 —— [ 微信小程式API ]