为什么事件closeCallout不生效？

<map 

class="map" 

id="map" 

longitude="{{longitude}}" 

latitude="{{latitude}}" 

markers="{{markers}}"

>

<cover-view slot="callout">

<cover-view class="callout-list" marker-id="{{calloutData.id}}" id="mid_{{calloutData.id}}">

<cover-view class="callout-title">

<cover-view class="t-left">热带低压</cover-view>

<cover-view  class="c-close" bind:tap="closeCallout" data-id="{{calloutData.id}}">x</cover-view>

</cover-view>

</cover-view>

</cover-view>

</map>