拓扑图例子,可以画线， 拖拽，实现了基本的功能,Example topology

flex 做得拓扑图 damo flex 做得拓扑图 damo,flex has done damo flex topology topology damo

这是用Flex实现的一个拓扑图，基本功能都实现了，只要学过AS的都会懂的.-This is achieved using Flex a topological map and the basic functions are realized as long as the studied AS metropolitan understand.