效果圖：

單個檔案上傳

如果需求是後端那邊需要接收的是一個檔案陣列型別的 那麼單個檔案上傳的就用不了

view:

 <view style='width:100%;'>
          <view wx:for="{{tempFilePaths}}"wx:key="{{index}}">
           <image src='{{item}}' class="upload"  data-id='{{index}}' bindlongtap='deleteImg'></image>
          </view>
         <image src='/images/upload.png' class="upload" bindtap='uploadImg'></image>
       </view>
 

js

var app = getApp();
var api = app.globalData.api;
uploadImgSubmit: function () {//這裡觸發圖片上傳的方法
    var that = this;
    var files = that.data.tempFilePaths;

    var host = api + 'api/wx/localeRecord/uploadImg';
    this.uploadimgs({
      url: host,//這裡是你圖片上傳的介面
      path: files//這裡是選取的圖片的地址陣列
    });
  },

//多張圖片上傳
  uploadimgs:function (data) {
    var that = this,
    i = data.i ? data.i : 0,
    success = data.success ? data.success : 0,
    fail = data.fail ? data.fail : 0;
    var userId = app.user.userId;
    wx.uploadFile({
      url: data.url,
      filePath: data.path[i],
      name: 'files',
      formData: {
        'dataId': boothId,
        'userId': userId,
        'param': 'LICENSE'
      },
      success: (resp) => {
        success++;
        that.setData({
          dataId: resp.data
        })
        console.log(resp)
        console.log(that.data.dataId);
        //這裡可能有BUG，失敗也會執行這裡
      },
      fail: (res) => {
        fail++;
        console.log('fail:' + i + "fail:" + fail);
      },
      complete: () => {
        console.log(i);
        i++;
        if (i == data.path.length) { //當圖片傳完時，停止呼叫   
          this.save();//上傳完後再執行的方法
          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.uploadimgs(data);
        }

      }
    });
  },

  //圖片上傳本地
  uploadImg:function(e){
    var that=this;
    wx.chooseImage({
      success: function (res) {
        var file = that.data.tempFilePaths;
        for (var i = 0; i < res.tempFilePaths.length;i++){
          file.push(res.tempFilePaths[i]);
        }
        // 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({
        tempFilePaths: file
      })
      }
    })
  },