uniapp 地图max 无法动态更改max-scale和min-scale

代码如下

<map id='map' :latitude="latitude" :longitude="longitude"  
                :style="{ width: '100%', height: mapHeight + 'px' }" :markers="markers" :scale="scale"  
                :polyline="polyline" @markertap="markertap" :enable-overlooking="true" :show-compass="true"  
                :show-location="showLocation" :max-scale="maxScale" :min-scale="minScale"  
                 :enable-traffic="traffic" :enable-satellite="satellite">  
            </map>  

data里   

latitude: 39.909604,  
                longitude: 116.397228,  
                scale: 13,  
                maxScale:20,  
                minScale:3,

然后在
beforeCreate生命周期或者mounted生命周期
修改
this.maxScale=13

都没有效果
还是用的20