学习日记-guid完整代码

module.exports = {        create: function() {            return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {                var r = Math.random() * 16 | 0,                    v = c == 'x' ? r : (r & 0x3 | 0x8);                return v.toString(16);            }).toUpperCase();        }    };