我们先给一个例子,说明已经加在关键的地方了:
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从例子我们可以看到,prototype是的方便之处在于它可以在外部定义一个方法,不过熟悉c#编程的人都应该更偏向于在一个类对象的内部定义它的方法,就如PublicFunc2,而不是象PublicFunc3,当然。
人人都说prototype定义的方法是不能访问内部变量的,事实上好象不是这样,我们在内部定义的PublicFunc2就可以访问x
综上,我们得出,this就是定义public变量或者方法的,var 定义的只是内部变量,只有在它的作用域中,我们才可以访问。至于prototy,可以在外部添加公有方法或变量(不知道这样有什么好处),在内部创建时是可以访问内部private变量的。此外prototype可以用于类的继承,如class1.prototype = class2; =>class1继承于class2