Swift

1，结构体struct和枚举enum的静态属性，静态方法使用static关键字

struct Account {  
    var amount : Double = 0.0                 //账户金额  
    var owner : String = ""                   //账户名  
 
    static var interestRate : Double = 0.668  //利率 
 
    static func interestBy(amount : Double) -> Double { 
        return interestRate * amount  
    } 
}

2，类class的类型属性，类型方法使用class关键字

class Account {
    var amount : Double = 0.0               // 账户金额  
    var owner : String = ""                 // 账户名  
  
    class var staticProp : Double { 
        return 0.668  
    }  
 
    class func interestBy(amount : Double) -> Double { 
        return 0.8886 * amount  
    }
}  
   
//访问静态属性  
println(Account.staticProp)