# Functions
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sender 跨selectLoop调用时，对方收到消息后，用sender回复消息 当多个相同item向一个管理类注册时，管理类在消息处理时，也必须通过sender分辨是哪个item的消息 一个selectLoop向自己注册消息，触发这类消息时，不需要填写sender，置nil即可.
# Structs
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# Interfaces
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