wxml

<view class="weui-cell">
  <view class="weui-cell__bd">
    <view class="weui-uploader">
      <view class="weui-uploader__hd">
        <view class="weui-uploader__title">點選可預覽選好的圖片</view>
        <view class="weui-uploader__info">{{pics.length}}/9</
 
view>
      </view>
      <view class="weui-uploader__bd">
        <view class="weui-uploader__files">
          <block wx:for="{{pics}}" wx:for-item="image">
            <view class="weui-uploader__file">
              <image class="weui-uploader__img" src="{{image}}"
 
 data-src="{{image}}" bindtap="previewImage"></image>
            </view>
          </block>
        </view>
        <!-- isShow 這個是判斷是否進行觸發點隱藏操作 -->
        <view class="weui-uploader__input-box {{isShow?'true':'hideTrue'}}">
          <view class="weui-uploader__input"
 
 bindtap="chooseImage"></view>
        </view>
      </view>
    </view>
  </view>
</view>

wxss

page {
  line-height: 1.6;
  font-family: -apple-system-font, "Helvetica Neue", sans-serif;
}
icon {
  vertical-align: middle;
}
.weui-cell {
  padding: 10px 15px;
  position: relative;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  align-items: center;
}
.weui-cell_input {
  padding-top: 0;
  padding-bottom: 0;
}
.weui-uploader__hd {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  padding-bottom: 10px;
  align-items: center;
}
.weui-uploader__title {
  flex: 1;
}
.weui-uploader__info {
  color: #b2b2b2;
}
.weui-uploader__bd {
  margin-bottom: -4px;
  margin-right: -9px;
  overflow: hidden;
}
.weui-uploader__file {
  float: left;
  margin-right: 9px;
  margin-bottom: 9px;
}
.weui-uploader__img {
  display: block;
  width: 79px;
  height: 79px;
}
.weui-uploader__input-box {
  float: left;
  position: relative;
  margin-right: 9px;
  margin-bottom: 9px;
  width: 77px;
  height: 77px;
  border: 1px solid #d9d9d9;
}
.weui-uploader__input-box:before, .weui-uploader__input-box:after {
  content: " ";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #d9d9d9;
}
.weui-uploader__input-box:before {
  width: 2px;
  height: 39.5px;
}
.weui-uploader__input-box:after {
  width: 39.5px;
  height: 2px;
}
.weui-uploader__input {
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
}

.hideTrue {
  display: none
}

js

var app = getApp();
Page({
  data: {
    pics: [],
    count: [1, 2, 3, 4, 5, 6, 7, 8, 9],
    isShow: true
  },
  onLoad: function (options) {
    // 生命週期函式--監聽頁面載入
    isShow: (options.isShow == "true" ? true : false)
  },
  // 圖片上傳
  chooseImage: function () {
    var _this = this,
      pics = this.data.pics;
    wx.chooseImage({
      count: 9 - pics.length, // 最多可以選擇的圖片張數，預設9
      sizeType: ['original', 'compressed'], // original 原圖，compressed 壓縮圖，預設二者都有
      sourceType: ['album', 'camera'], // album 從相簿選圖，camera 使用相機，預設二者都有
      success: function (res) {
        // success
        var imgSrc = res.tempFilePaths;   //圖片路徑
        pics = pics.concat(imgSrc);   //選取的圖片的地址陣列
        // 控制觸發新增圖片的最多時隱藏
        if (pics.length >= 9) {
          _this.setData({
            isShow: (!_this.data.isShow)
          })
        } else {
          _this.setData({
            isShow: (_this.data.isShow)
          })
        }
        _this.setData({
          pics: pics
        })
      },
      fail: function () {
        // fail
      },
      complete: function () {
        // complete
      }
    })
  },
  // 圖片預覽
  previewImage: function (e) {
    var current = e.target.dataset.src
    wx.previewImage({
      current: current,
      urls: this.data.pics
    })
  }

uploadimg:function(){//這裡觸發圖片上傳的方法
       var pics=this.data.pics;
       app.uploadimg({
           url:'https://........',//這裡是你圖片上傳的介面
           path:pics//這裡是選取的圖片的地址陣列
        });
  },

})

在app.js中寫一個多張圖片上傳的方法,後面引入，你也可以寫在一個JS檔案中，後面引入：

//多張圖片上傳
    function uploadimg(data){
     var that=this,
         i=data.i?data.i:0,//當前上傳的哪張圖片
         success=data.success?data.success:0,//上傳成功的個數
         fail=data.fail?data.fail:0;//上傳失敗的個數
      wx.uploadFile({
            url: data.url, 
            filePath: data.path[i],
            name: 'file',//這裡根據自己的實際情況改
            formData:null,//這裡是上傳圖片時一起上傳的資料
            success: (resp) => {
               success++;//圖片上傳成功，圖片上傳成功的變數+1
               console.log(resp)
                console.log(i);
                //這裡可能有BUG，失敗也會執行這裡,所以這裡應該是後臺返回過來的狀態碼為成功時，這裡的success才+1
            },
            fail: (res) => {
                fail++;//圖片上傳失敗，圖片上傳失敗的變數+1
                console.log('fail:'+i+"fail:"+fail);
            },
            complete: () => {
                console.log(i);
                i++;//這個圖片執行完上傳後，開始上傳下一張
            if(i==data.path.length){   //當圖片傳完時，停止呼叫          
                console.log('執行完畢');
                console.log('成功：'+success+" 失敗："+fail);
            }else{//若圖片還沒有傳完，則繼續呼叫函式
                console.log(i);
                data.i=i;
                data.success=success;
                data.fail=fail;
                that.uploadimg(data);
            }
                
            }
        });
    }

效果圖，可點選放大預覽