javascript 种继承机制

javascript 类继承机制
Javascript类的继承是通过constructor和prototype来实现的

1. 定义一个形如java的person类，然后实例化和调用它的属性
  

   // Set the property of the prototype of man    man.prototype.name = 'changed value';   // The property of the instance of subclass wouldn't be changed   alert(m1.name);   // The property of the prototype has been changed   alert(p1.name);