微信小程序同时上传多个图片方法

先上代码:如下，主要用promise.all来实现等待所有的请求完毕后关闭loading。

 upImg(e) {
    const index = e.currentTarget.dataset.index
    const count = this.data.field_data[index].imgList.length;
    this.setData({
      field_data:this.data.field_data
    })
    console.log('count',count)
    if(count===10){
      wx.showToast({
        title: '图片不能超过10张',
        icon: 'none',
        image: '',
        duration: 1500,
        mask: false,
        success: (result)=>{
          
        },
        fail: ()=>{},
        complete: ()=>{}
      });
      return
    }
    const that = this
    wx.chooseImage({
      count: 10 - count,
      success: res => {
        console.log('res图片',res)
        // const list = [...this.data.imgList,...res.tempFilePaths]
        // this.setData({
        //   imgList: list
        // });
        const header =  {
          'content-type': 'application/json'
        }
        header.authKey = wx.getStorageSync('authKey') || '';
        header.sessionId = wx.getStorageSync('sessionId') || ''
        wx.showLoading({
          title: '图片加载中...',
          mask: true,
          success: (result)=>{
            
          },
          fail: ()=>{},
          complete: ()=>{}
        });
        let allRequest = []
        res.tempFilePaths.forEach((item,i,arr)=>{
              allRequest[i] = new Promise((resolve)=>{
              wx.uploadFile({
                url:HTTP_REQUEST_URL+ '/api/common/upload',
                filePath:item,
                header:header,
                name:'file',
                formData: {},
                success: (result)=>{
                    // console.log('上传成功',JSON.parse(result.data).data)
                    resolve(result)
                    const list = [...that.data.field_data[index].imgList,...[
                      {src:JSON.parse(result.data).data.url,title:JSON.parse(result.data).data.url.split('/')[6].substring(0,12)}
                      
                    ]   
                    ]
                    that.data.field_data[index].imgList = list
                    that.data.field_data[index].count = list.length
                    that.setData({field_data:that.data.field_data})
                },
                fail: (err)=>{
                  wx.hideLoading()
                  console.log('上传失败',err)
                },
                complete: ()=>{}
              });
            })
        })
        Promise.all(allRequest).then(res=>{
          wx.hideLoading()
        }
        )
            
      },
      fail: err => {
        wx.showToast({
          title: err,
          icon: 'none'
        })
      }
    })
  },