set - <!--#set var="foo" value="Bar" --> 用来为用户定义变量赋值
if elif endif else - 用于条件判断,例如: <!--#config timefmt="%A" --> <!--#if expr="$DATE_LOCAL = /Monday/" --> <p>Meeting at 10:00 on Mondays</p> <!--#elif expr="$DATE_LOCAL = /Friday/" --> <p>Turn in your time card</p> <!--#else --> <p>Yoga class at noon.</p> <!--#endif -->