一样的 看源代码

/**
* Returns the relative URL for the application.
* This is a shortcut method to {@link CHttpRequest::getBaseUrl()}.
* @param boolean $absolute whether to return an absolute URL. Defaults to false, meaning returning a relative one.
* @return string the relative URL for the application
* @see CHttpRequest::getBaseUrl()
*/
public function getBaseUrl($absolute=false)
{
    return $this->getRequest()->getBaseUrl($absolute);
}

熟悉OOP后 你就能体会区别了

public function save()
{
    $main=new Main();
    $main->findByPk(3);
    $main->value=$cssClass;
    $main->save();
}

这里改成

public function save()
{
    $main=new Main();
    $main->findByPk(3);
    $main->value=$this->cssClass;
    $main->save();
}

从 Yii 权威指南 开始入门吧:)

'options' => array(
  'changeYear' => 'true',

加上这个就行了