Unlike the Java language, JavaFX Script does not require you to specify a variable's type in its declaration. 与Java语言不同,JavaFXScript不要求在声明中指定变量的类型。
Because Ruby does not require instance variable declaration, the simplest way to model instance variables is with a hash. 由于Ruby并不需要声明实例变量,因此建模实例变量最简单的方式就是使用散列。