相当于Object.assign的Lua

const target = { a: 1 };
const source1 = { b: 2 };
const source2 = { c: 3 };

Object.assign(target, source1, source2);

console.log(target); // 输出: { a: 1, b: 2, c: 3 }

function object_assign(target, ...)
    for _, source in ipairs({...}) do
        for k, v in pairs(source) do
            target[k] = v
        end
    end
    return target
end

local target = { a = 1 }
local source1 = { b = 2 }
local source2 = { c = 3 }

object_assign(target, source1, source2)

print(table.concat({table.unpack(target)}, ", ")) -- 输出: a = 1, b = 2, c = 3

function deep_copy(orig)
    local orig_type = type(orig)
    local copy
    if orig_type == 'table' then
        copy = {}
        for orig_key, orig_value in next, orig, nil do
            copy[orig_key] = deep_copy(orig_value)
        end
        setmetatable(copy, deep_copy(getmetatable(orig)))
    else
        copy = orig
    end
    return copy
end

local target = { a = 1, b = { c = 2 } }
local source = { b = { d = 3 }, e = 4 }

object_assign(target, source)

print(table.concat({table.unpack(target)}, ", ")) -- 输出: a = 1, b = table: 0x..., e = 4