说明：  详细讲解了javascript做为一门面向对象语言的相关特性，并展示了javascript中类的概念，通过一些例子说明了javascript中代码的封装，继承等特性。
(Explained in detail as a javascript object-oriented language of the relevant features, and shows the javascript in the class concept, through a number of examples of the javascript in the code encapsulation, inheritance and other features.)