function extend(Child, Parent) {

　　　　var F = function(){};
　　　　F.prototype = Parent.prototype;
　　　　Child.prototype = new F();
　　　　Child.prototype.constructor = Child;
　　　　Child.uber = Parent.prototype;
}

function extend2(Child, Parent) {
　　　　var p = Parent.prototype;
　　　　var c = Child.prototype;
　　　　for (var i in p) {
　　　　　　c[i] = p[i];
　　　　　　}
　　　　c.uber = p;
}

var Shape = function(){}
var TwoDShape = function(){}
Shape.prototype.name = 'shape';
Shape.prototype.toString = function(){
 return this.name;
}
extend2(TwoDShape,Shape);
var t = new TwoDShape();
t.name
//-->"shape"
t.toString();
//-->"shape"
TwoDShape.prototype.name = 'TwoDShape';
t.name
//-->"2d shape"
t.toString();
//-->"2d shape"

TwoDShape.prototype.toString === Shape.prototype.toString
//-->true
TwoDShape.prototype.name === Shape.prototype.name
//-->false