## 惯用法
\document_class[KIND][SHORT] {OPTIONS}
\enable_target[tex|pdf]
\target_if[html] {
}
<\target_match>
case tex|pdf:
\document_class[article][a4,two side,11pt];
cast html:
\document_class[article][a4,two side,11pt];
else:
\document_class[article][a4,two side,11pt];
</target_match>