git clone git@github.com:slashhuang/design-patterns-tutorial.git --depth=1
cd design-patterns-tutorial
## open html file to check results
简易日志系统演示simple decorator log system
简单的对象回调数组演示 simple observer array
结合事件进行的订阅发布模式 pub-sub handler combined with DOM events
内存管理之单例模式 memory saving strategy with singleton