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local a = SomeClass.New()
local b = SomeClass.New()
local c = SomeClass.New()
msg = Messenger.New
msg:AddListener(type1, a.func)
msg:AddListener(type1, b.func) -- Already cotains listener
msg:AddListener(type1, c.func) -- Already cotains listener
以上面代码为例,想要a, b, c三个 SomeClass 的实例都监听 type1 事件,那么这样写,b和c会被吞掉,报错 Already cotains listener
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