javascript--面向对象（五）动态原型模式

动态原型模式（让你的代码都 封装在一起  封装性）

function Person(name,age,friends,job){this.name = name;this.age =age;this.friends = friends;this.job;        //动态原型方法if(typeof this.sayName != "function"){Person.prototype.sayName = function(){console.info(this.name);}}}