$smarty->setLeftDelimiter('{'); //左定界符
$smarty->setRightDelimiter('}'); //右定界符
$smarty->setTemplateDir('tpl'); //html模板的地址
$smarty->setCompileDir('template_c'); //模板編譯生成的文件
$smarty->setCacheDir('cache'); //緩存地址
$smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
$smarty->setCacheLifetime(300);
