swift学习之路（十四）类的定义

一、类的定义

import Foundation

class TV{

    var keyCount =
"12"

    var keyName =
"Power"

    func openTV()->String{

        return
"TV is opened"

    }

}

var miTV = TV()

print(miTV.keyName)

//类是值类型,miTV.keyName
的值发生改变

var myTV = miTV

myTV.keyName =
"hello"

print(miTV.keyName)

//用 ===
或
！==
判断是否属于同一的类

print(miTV ===
myTV)

print(miTV !==
myTV)