<view class="front_box" data-type="2" bindtap="bindUploadFile">
        <image class="idcard_outline" src="{{frontPic}}"></image>
        <view class="flex tip">
          <image class="icon-cammer" src="{{imgUrl}}icon-cammer.jpg"></image>
          <text>点击扫描身份证</text>
          <text class="bold PingFangM">人像面</text>
        </view>

bindUploadFile(e){
    let that=this;
    let type =e.currentTarget.dataset.type;
    console.log(that.data.orderNo)
    wx.chooseImage({
      count: 1,
      sizeType: ['original', 'compressed'],
      sourceType: ['album', 'camera'],
      success(res) {
        // tempFilePath可以作为img标签的src属性显示图片
        const tempFilePaths = res.tempFilePaths
        console.log(tempFilePaths)
        let imgFormat = tempFilePaths[0].substring(tempFilePaths[0].lastIndexOf(".") + 1, tempFilePaths[0].length);
        wx.getFileSystemManager().readFile({
          filePath: res.tempFilePaths[0], //选择图片返回的相对路径
          encoding: 'base64', //编码格式
          success: ret => { //成功的回调
            // console.log('data:image/png;base64,' + ret.data)
            let param={
              flag: "flag",
              rqstType: 'AJAX',
              channelNo: '23',
              identifyNo: '1',
              ocrType: '07',
              imgType: imgFormat,
              paramData: ret.data,
              type: type,
              orderNo: that.data.orderNo,
              customType: '1',
              contNo: that.data.orderNo
            }
            request({
              url: 'OCR',
              data: param
            }).then(rest=>{
              let data = JSON.parse(rest.MESSAGE);
              wx.showToast({
                title: data.message.value,
                icon: 'none'
              })
              if(type==='2'){
                if (data.cardsinfo){
                  that.setData({
                    'cardInfo.name': data.cardsinfo.card.item[1],
                    'cardInfo.sex': data.cardsinfo.card.item[2],
                    'cardInfo.birthday': data.cardsinfo.card.item[4],
                    'cardInfo.idNo': data.cardsinfo.card.item[6],
                    frontPic: tempFilePaths,
                    frontPicFlag: true
                  })
                }
              }else{
                if (data.cardsinfo) {
                  that.setData({
                    'cardInfo.endDate': data.cardsinfo.card.item[4],
                    backPic: tempFilePaths,
                    backPicFlag: true
                  })
                }
              }
            })
          }
        })
      }
    })
  }

在wx.chooseImage 的时候打开相册，选择完成以后又跳回到相册中如何解决（没有报错，走的是success，我也没有再次调用接口），有时候会出现，有时候不会出现