扩展实例，添加关闭和开启命令undo
Merge branch 'dev-1.3.0' of https://github.com/campaign/ueditor into dev-1.3.0
Merge branch 'dev-1.3.0' of https://github.com/campaign/ueditor into dev-1.3.0
修改了uparse的架构
修改了uparse的架构
Merge remote-tracking branch 'origin/dev-1.3.0' into dev-1.3.0