用递归？

<a href="/topics/3600#comment15" title="15">#15<span>楼</span></a> <a href="/user/fenglangjuxu" title...

<a href="/topics/3600#comment12" title="12">#12<span>楼</span></a> <a href="/user/tk103331" title="@t...

mark

<a href="/topics/3600#comment6" title="6">#6<span>楼</span></a> <a href="/user/jthmath" title="@jthma...

楼主v5

<a href="/topics/3600#comment5" title="5">#5<span>楼</span></a> <a href="/user/fenglangjuxu" title="@...

<a href="/topics/3600#comment2" title="2">#2<span>楼</span></a> <a href="/user/polaris" title="@polar...

<a href="/topics/3600#comment1" title="1">#1<span>楼</span></a> <a href="/user/lwldcr" title="@lwldcr...