uniapp mapId 微信开发者工具取不到

VM4646:5 TypeError: Cannot read property 'mapId' of undefined

<map id="map" style="width: 100%; height: 300px;" :scale="scale" :latitude="latitude" :longitude="longitude" :markers="markers" show-location="true" @markertap="moveToLocation()"></map>

额 哪里写的有问题吗？ 真机测试能取到