• 当前 Bug 的表现（可附上截图）

• 预期表现

• 复现路径

• 提供一个最简复现 Demo

// 是否可以提交     if (submitEnable) {       this.data.test.finish = true;       // 根据_openid 和 testId查询是否存在测试记录       mytest.where({         _openid: global.openid,         testId: this.data.test.testId       }).get({         success: res => {           if (res.data.length > 0) {             delete this.data.test._openid             delete this.data.test._id             mytest.doc(res.data[0]._id).set({               data: this.data.test             }).then(res => {               console.log("mytestId:======" + res._id);               console.log(res);               wx.navigateTo({                 url: '/pages/result/result?id=' + res._id               })             })           } else {             mytest.add({               data: this.data.test             }).then(res => {               wx.navigateTo({                 url: '/pages/result/result?id=' + res._id               })             })           }         }       });             }

上面这个是本地调试更新某个数据返回的结果，_id有值

下面这个是真机调试更新某个数据返回的结果，_id为""?