javascript - 放大时传单动画不起作用

Question

我想在这个例子中实现动画

http://leaflet.github.io/Leaflet.markercluster/example/marker-clustering-realworld.388.html

但对我来说一切都在工作，除了动画

  this.markerClusterGroup = L.markerClusterGroup({ removeOutsideVisibleBounds: true, animate: true,
      animateAddingMarkers: true });

我还导入了样式

<link rel="stylesheet" href="/bower_components/leaflet.markercluster/dist/MarkerCluster.css">

我错过了什么？

标签： javascriptleafletleaflet.markercluster