js新手基础有关问题2

var Class = {
            create: function() {
                return function() {
                    this.initialize.apply(this, arguments);
                };
            }
        };
        Object.extend = function(a, c) {
            for (var b in c) {
                a[b] = c[b];
            }
            return a;
        };
          
        var Client = Class.create();
        Object.extend(Client.prototype, {
            name: "Hotel",
            InDays: 20,
            afterDays: 180
        });
        alert(Client.prototype.name); //弹出Hotel