代码如下：var latitude = res.latitude         var longitude = res.longitude         changePosition.latitude = latitude         changePosition.longitude = longitude         Momenry.where({           _id:newId         }).update({           data:{             hasDone:'ywc',             changeTime:thismoment,             changePosition:changePosition           },success(res){             wx.navigateTo({               url: '/pages/memorandum/memorandum?Uname='+Uname+'&openid='+openid,             })           },fail(res){             console.log(res,changePosition)             wx.showToast({               title: '修改失败'             }),             wx.redirectTo({               url: '/pages/memorandum/memorandum?Uname='+Uname+'&openid='+openid,             }) 报错如下：Error: errCode: -502001 database request fail | errMsg: [FailedOperation] multiple write errors: [{write errors: [{Cannot create field 'latitude' in element {changePosition: ""}}]}, {<nil>}]     at new g (VM300 WAService.js:2)     at Function.success (VM300 WAService.js:2)     at C (VM300 WAService.js:2)     at Object.success (VM300 WAService.js:2)     at B (VM300 WAService.js:2)     at Q (VM300 WAService.js:2)     at VM300 WAService.js:2     at VM8 asdebug.js:1     at T (VM8 asdebug.js:1)     at VM8 asdebug.js:1 在我下的小程序中前边一样的写法，能够通过并获得我想要的结果，这里就不行了