JavaScript几种沿袭继的方法总结

JavaScript几种继承继的方法总结
总结出JavaScript有以下几种继承继的方法：

1.对象冒充方法,可以多承继;

如：

 A=function()
  {
    this.code="001";
    this.name="whiteangell";
    this.getCode=function()
    {
      return this.code;
    }
    this.getName=function()
    {
     return this.name
    }
  };

  B = function()
  {
      this.newMethod=A;
      this.newMethod();
      this.age=20;
      this.getAge=function()
      {
        return this.age;
      }

  };
  var bb = new B();
  alert(bb.getName());

2.原型链法;

如：

 A=function()
  {
    this.code="001";
    this.name="whiteangell";
    this.getCode=function()
    {
      return this.code;
    }
    this.getName=function()
    {
     return this.name
    }
  };
  B = function()
  {      
      this.age=20;
      this.getAge=function()
      {
        return this.age;
      }
  };
  B.prototype=new A();
  var bb = new B();
  alert(bb.getName());

3.拷贝复制法
如：

 
  Object.extend = function(destination,source)
    {
        for ( pro in source )
        {
            destination [pro] = source [pro];
        }
        return destination ;
    };  
  A = function(){};
  A.prototype =
  {
    code:"001",
    name:"whiteangell",
    getCode:function()
    {
      return this.code;
    },
    getName:function()
    {
     return this.name
    }
  };
  B= function(){};
  B.prototype= Object.extend({
  age:20,
      getAge:function()
      {
        return this.age;
      }
  },A.prototype);  
  var bb = new B();
  alert(bb.getName());

4.call()方法,可以多承继;

如：

  A=function()
  {
    this.code="001";
    this.name="whiteangell";
    this.getCode=function()
    {
      return this.code;
    }
    this.getName=function()
    {
     return this.name
    }
  };
  B = function()
  {      
      A.call(this);
      this.age=20;
      this.getAge=function()
      {
        return this.age;
      }

  };
  var bb = new B();
  alert(bb.getName());

5.apply()方法,可以多承继;

如：

  A=function()
  {
    this.code="001";
    this.name="whiteangell";
    this.getCode=function()
    {
      return this.code;
    }
    this.getName=function()
    {
     return this.name
    }
  };
  B = function()
  {      
      A.apply(this);
      this.age=20;
      this.getAge=function()
      {
        return this.age;
      }
  };
  var bb = new B();
  alert(bb.getName());