(PECL haru >= 0.0.1)
HaruOutline::setOpened — Set the initial state of the outline
$opened
   ) : boolDefines whether this node is opened or not when the outline is displayed for the first time.
opened
       TRUE means open, FALSE - closed.
      
   Returns TRUE on success.
  
发生错误时抛出 HaruException 异常。