为JavaScript所有对象添加一个继承方法

本继承方法仍然是基于JavaScript原型属性来实现的.

Function.prototype.inherit = function(parent){
   this.prototype = Object.create(parent.prototype);
   this.prototype.constructor = this;
};

 本方法扩展到Function对象上,目的是让JavaScript中所有的构造函数都拥有此方法.

参数说明:

       * parent: 被继承的父类构造函数.

用法示例如下:

Function.prototype.inherit = function(parent){
    this.prototype = Object.create(parent.prototype);
    this.prototype.constructor = this;
};

function People(name,age){
   this.name = name;
   this.age = age;
}
People.prototype = {
   getName:function(){
      return this.name;
   },
   say:function(){
      console.log("hello");
   }
};


function Student(name,age,id){
   People.call(this,name,age);
   this.id = id;
}

Student.inherit(People);

Student.prototype.getId = function(){
   return "this id is " + this.id;
};


var s = new Student("Jhon",22,3.1415926);

console.log(s.getName());
console.log(s.say());
console.log(s.getId());
console.log(s.constructor);