velocity 注释语法

(1)单行注释：
## This is a single line comment.
(2)多行注释：
#*
Thus begins a multi-line comment. Online visitors won’t
see this text because the Velocity Templating Engine will
ignore it.
*#
(3)文档格式：
#**
This is a VTL comment block and
may be used to store such information
as the document author and versioning
information:
@version 1.1

@author xiao
*#