title = isset($title) ? $title : '提示';
$content = isset($content) ? $content : '';
$class = isset($class) ? $class : 'info';
$class = in_array($class,['danger','warning','success','info']) ? $class : 'info';
$buttons = isset($buttons) ? $buttons : [['title'=>'好的，我知道了','class'=>'primary','url'=>false]];
?>