class daysofaweek { private var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "saturday"] subscript(index: Int) -> String { get { return days[index] // 声明下标脚本的值 } set(newValue) { self.days[index] = newValue // 执行赋值操作 } } } var p = daysofaweek() print(p[0]) print(p[1]) print(p[2]) print(p[3])