javascript 面向对象

function myClass(a , b) {

      this.a = a ;

      this.b = b;

      this.toString = function() {

         return this.a + "," + this.b;

      };

}

 

var obj = new myClass('hello' , 'world');

alert(obj);

 

打印的是hello,world.

 

this.toString=function() {

      return this.a  + "," + this.b;

};

等同于

myClass.prototype.toString = function() {

     return this.a + "," + this.b;

};

 

看视频猜的，不知道对不对 ，感觉javascript很奇怪，也很博大精深，看来一声都得用功夫啊