[Lua]rawget & rawset

参考链接：

https://www.jianshu.com/p/78f0e050ddad

 

TestRawGetSet.lua

function TestRawGetSet()
    --rawget & rawset：绕过元表，直接获取或设置table的值
    local a = {a1 = 10}
    setmetatable(a, {
        __index = {a2 = 20},
        __newindex = function (t, key, value)
            print(key .. "_" .. value)
        end
    })

    print(a.a2) --20
    print(rawget(a, "a2")) --nil
    
    a.a3 = 30 --a3_30
    print(a.a3) --nil
    rawset(a, "a3", 40)
    print(a.a3) --40
end

TestRawGetSet()