Swift——类的基本属性

//类class Student: NSObject{        //存储属性:    var age :Int=0    var name:String?    var mathScore:Double=0.0    var chineseScore:Double=0.0        //计算属性; 平均成绩    var averageScroe:Double{             return(mathScore+chineseScore)/2;    }        //定义类属性：类属性是和整个类相关的属性，而且是通过类名进行访问的    static var courseCount:Int=0            }//给类属性进行赋值Student.courseCount=2;//创建对象let p=Student()//对象属性赋值p.age=10p.name="哈哈"p.mathScore=99.1p.chineseScore=34.2print(p.averageScroe)