# Packages
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# Functions
NewClient 通用mongo client.
NewCocoClient 本机coco数据库的mongo client.
NewCocoClient2 宿主机连接coco数据库的mongo client 在容器中暴露27017的端口映射到27018的宿主机上, 所以这里访问27018端口 来实现在宿主机上访问容器内的mongo.
# Constants
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