Use the event system in Lua to monitor and dispatch events, remove

There are 2 ways to use events in Lua:
1. The event system defined in C# is called at the Lua layer. I also wrote one https://blog.csdn.net/baidu_39447417/article/details/79764962

2. Define the event system in the Lua layer, the code is as follows

EventSystem={}
--添加事件 eventType-->事件类型  func-->方法
function EventSystem.AddListener(eventType,func)
    if(eventType==nil or func==nil)then
        log('在EventSystem.AddListener中eventType或func为空')
        return
    end
    if(EventSystem[eventType]==nil)then
        local a={}
        table.insert(a,func)
        EventSystem[eventType]=a
    else
        table.insert(EventSystem[eventType],func)
    end
end
--移除事件
function EventSystem.RemoveListener(eventType,func)
    if(eventType==nil or func==nil)then
        log('在EventSystem.RemoveListener中eventType或func为空')
        return
    end
    local a=EventSystem[eventType]
    if(a~=nil)then
        for k,v in pairs(a) do
            if(v==func)then
                a[k]=nil
            end
        end
    end
end

--派发事件
function EventSystem.SendEvent(eventType,...)
    if(eventType~=nil)then
        local a=EventSystem[eventType]
        if(a~=nil)then
            for k,v in pairs(a) do
                v(...)
            end
        end
    end
end

return EventSystem

Be sure to note that if the event has a listener, there must be a removal listener