所有没有指定类型的“…参数被认为是相同的。”
In normal circumstances, you can wire a property only to an action that has an identical type.一般情况下，我们只将某个类型属性连接到类型与其相同的行为。
When you call a function, what actually happens is that function gets its own chunk of memory that's identical in size to the data type that it expects.当你调用一个函数，实际上发生的是函数得到了自己的内存块，它的大小与它期望的数据类型相同。
