//圣杯模式
function inherit(Target,Origin){
function F(){}
F.prototype = Origin.prototype;
Target.prototype = new F();
Target.prototype.constuctor = Target;
Target.prototype.uber = Origin.prototype;
}
Father.prototype.lastName = 'susan';
function Father(){}
function Son(){}
inherit(Son,Father);
var father = new Father();
var son = new Son();