实现评论的功能.
修改一些功能。
add some code.
add some error handling.
add somem code.add somem code.add somem code.add somem code.add somem code.add somem code.add somem code.add somem code.add somem code.
优化代码。
Merge branch 'master' of github.com:wangyangkobe/jiamian