所有的字段都是成员字段，除非修饰符标记为 static 。Static字段用在类上，就像非静态字段用在类的实例上。 > All fields are member fields unless the modifier static is used. Static fields are used “on the class” whereas non-static fields are used “on a class instance”: ~~~ class Main { static function main() { Main.staticField; // static read Main.staticField = 2; // static write } static var staticField:Int; } ~~~ 静态变量（第4.1节）和属性（第4.2节）字段可以使用任意的初始化表达式（第5章）. > Static variable (4.1) and property (4.2) fields can have arbitrary initialization expressions (5).