微信小程序多图上传

uploadFile:function (imgArr,data){
      var _this = this,
        i = imgArr.i ? imgArr.i : 0;
        if (i == 0 && imgArr.length > 0) {
          wx.showLoading({
            title: '上传中',
          })

        }else{
          return ;
        }
        wx.uploadFile({
          url: 'urp',
          filePath: imgArr[i],
          name: 'file',
          header: {
            'Content-type': 'multipart/form-data' // 默认值
          },
          formData: {
            data: JSON.stringify(data)
          },
          success(res) {
            var resCode = JSON.parse(res.data)
            if (resCode.msg == 'ok') {
              i++;
              if (i == imgArr.length) {
                 wx.hideLoading({
                   success:function(){
                     wx.showToast({
                       title: '提交成功',
                       icon: 'success',
                       duration: 1000,
                       success:function(){
                         setTimeout(function(){
                           wx.navigateBack({
                             delta: 1
                           })
                         },1000)
                       }
                     })
                   }
                 })
              }else{
                imgArr.i = i;
                _this.uploadFile(imgArr,id,requstType)
              }
            }else{
              wx.showToast({
                title: '上传失败',
                icon: 'fail',
                duration: 1000,
              })
            }
          }
        })