1.struct,值类型，结构体会自动生成初始化方法，class是引用类型
struct Person { var name : String var age : Int func simpleDescription() -> String { return "name = \(name) , age = \(age)" } } let p = Person(name: "ly", age: 9) let k = p.simpleDescription() print(k)
原文：http://www.cnblogs.com/zhangjie579/p/6626884.html