<map id="map" longitude="{{currentLocation.longitude}}" latitude="{{currentLocation.latitude}}" scale="14" controls="{{controls}}" bindcontroltap="controltap" bindmarkertap="markertap" polyline="{{polyline}}" bindregionchange="regionchange" show-location >
    <cover-image class="icon-map-center" src="/images/icon_location.png"/>
</map>

此处想让cover-image 水平垂直居中，设置了map的display属性为flex,然后发现貌似设置无效，flex的任何特性都不能正常发挥