blackbird消息弹出框(彻底替换alert)

Blackbird 是一个开源的JavaScript库，提供了一种简单的记录日志的方式和一个控制台窗口，有了这个之后，你就可以抛弃alert() 了。
Usage
Public API
log.toggle() Hide/show Blackbird
log.move() Move Blackbird to next fixed positions: top-left, top-right, bottom-left, bottom-right
log.resize() Expand/contract Blackbird
log.clear() Clear all contents of Blackbird
log.debug( message ) Add a debug message to Blackbird
message: the string content of the debug message
log.info( message ) Add an info message to Blackbird
message: the string content of the info message
log.warn( message ) Add a warning message to Blackbird
message: the string content of the warn message
log.error( message ) Add an error message to Blackbird
message: the string content of the warn message
log.profile( label ) Start/end a time profiler for Blackbird. If a profiler named string does not exist, create a new profiler. Otherwise, stop the profiler string and display the time elapsed (in ms).
label: the string identifying a specific profile timer