版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/prunecluster/2.1.0/LeafletStyleSheet.css
- https://cdn.bootcdn.net/ajax/libs/prunecluster/2.1.0/LeafletStyleSheet.min.css
- https://cdn.bootcdn.net/ajax/libs/prunecluster/2.1.0/PruneCluster.d.ts
- https://cdn.bootcdn.net/ajax/libs/prunecluster/2.1.0/PruneCluster.js
- https://cdn.bootcdn.net/ajax/libs/prunecluster/2.1.0/PruneCluster.min.js