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