琴吖

摘要： //变量var intNum:Int = 1 var floatNum:Float = 10.2 //浮点型 var double:Double = 10.3333 //双精度浮点型 var isSuccess:Bool = true //false //布尔类型var str:String ="hello swift" //字符串var 名称：String = "... 阅读全文