背景

对于OO思想实现的类， 对于某些场景需要屏蔽某些方法， 不让调用。过了这段场景， 就恢复这些类的方法， 可以调用。

 

例如：

工厂具有开工方法， 但是在晚上不允许开工， 所有在晚上这段时间， 见开工方法屏蔽掉， 到第二天早上八点将此方法恢复。

实现

 

local tab = {    new = function()        print("new is called.")    end,    delete = function()        print("delete is called.")    end,}tab.new()tab.delete()function setHiddenProperty(tab, name)    if not tab[name] then        return    end    if not tab.__hiddenProps then        tab.__hiddenProps = {}    end    local hiddenProps = tab.__hiddenProps    hiddenProps[name] = tab[name]    tab[name] = nilendfunction restoreHiddenPorpertys(tab)    local hiddenProps = tab.__hiddenProps    if not hiddenProps then        return    end    for k,v in pairs(hiddenProps) do        tab[k] = v    end    tab.__hiddenProps = nilendsetHiddenProperty(tab, "new")setHiddenProperty(tab, "delete")-- this time call new and delete will throw error--tab.new()--tab.delete()restoreHiddenPorpertys(tab)tab.new()tab.delete()

 

LOG:

>lua -e "io.stdout:setvbuf 'no'" "luatest.lua"

new is called.

delete is called.

new is called.

delete is called.

>Exit code: 0