对象继承

;(function () {
    var o = {
        inheritObject:function (obj) {
            var F = function () {}
            F.prototype = obj;
            return new F();
        },
        inheritPrototype:function (subclass, superclass) {
            var o = this.inheritObject(subclass.prototype);
            o.constructor = subclass;
            subclass.prototype = o;
        }
    }
   window.objUtil = o;
})();