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 = "zhang";    
    function Father() {};
    function Son() {};

    inherit(Son, Father);
    var son = new Son();
    var father = new Father();