var CVec3 = function ()
{
    this.x = 0.0;
    this.y = 0.0;
    this.z = 0.0;
    this.ToString=function()
    {
        return ""+this.x+","+this.y+","+this.z;
    };
};
var CBound = function ()
{
    this.position = new CVec3();
    this.ToString=function()
    {
        return position.ToString();
    };
};

var dummy=new CBound();
alert(dummy.ToString());

작동을 안하는데 왜 이런 건가요????