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();    
    }    
};