Blackbird offers a dead-simple way to log messages in JavaScript and an attractive console to view and filter them. You might never use alert() again.
BlackBirdjs，作者的理念是：Say GoodBye to Alert() !，借签了Log4j的思路，使用简单，界面华丽，强烈推荐！
官方地址：http://www.gscottolson.com/blackbirdjs/