Lua中的值传递和引用传递
老规矩，直接代码
值传递
-- 例1
a = 1
b = a
b = 2
print("a ==",a)
-- 输出：a == 1
-- 例2
a = "this is str"
b = a
b = "this is not str"
print("a ==",a)
-- 输出：a == this is str
-- 例3
function fun1(a)
a = 2
end
b = 1
fun1(b)
print("b ==",b)
-- 输出：b == 1
-- 例4
function fun1()
print("this is fun1")
end
function fun2()
print("this is fun2")
end
a = fun1
b = a
a = fun2
a()
b()
--[[ 输出：this is fun2
this is fun1 ]]
-- 例5
a = {"您好","Hello"}
b = a[1]
a[1] = "非常好"
print("b == ",b)
-- 输出：b == 您好
引用传递
-- 例6
a = {1,2}
b = a
a = {"q","w"}
for k,v in pairs(b) do
print(k,v)
end
-- [[输出：1 q
-- 2 w
从上面的例子结果得出：
-
例子1到5都是值传递，只有例子6是引出传递 只有参数是table的时候是引用传递（相当于一个指针a将地址传给指针b,它们所指向的内容都是一样的）
