小编Max*_* Ch的帖子

我正在 Joomla 后端对表格列进行排序。我根据本教程调整设置。

正如我们所见，建议覆盖populateState方法并手动获取排序选项。

public function populateState() {
    $filter_order = JRequest::getCmd('filter_order');
    $filter_order_Dir = JRequest::getCmd('filter_order_Dir');

    $this->setState('filter_order', $filter_order);
    $this->setState('filter_order_Dir', $filter_order_Dir);
}

但是我注意到本机组件com_content没有在模型文件中明确设置这些选项administrator/components/com_content/models/articles.php。

protected function populateState($ordering = null, $direction = null)
{
    // Initialise variables.
    $app = JFactory::getApplication();
    $session = JFactory::getSession();

............................................
............................................
............................................

    // List state information.
    parent::populateState('a.title', 'asc');
} 

相反，它只是调用 parent populateState。事实上JModelList::populateState()包括这个：

protected function populateState($ordering = null, $direction = null)
{
    // If the context is set, assume that stateful …

var x = 9;
var mod = {
    x: 81,
    assign: function(){
        this.x = 9;
        x = 3;
    },
    checkVars: function(){
        alert(x + " - " + this.x );
    }
};

mod.checkVars(); //9 - 81

mod.assign();
mod.checkVars(); //3 - 9

alert(x); //3

请解释范围链如何在这里设置自己.为什么范围解析为xin checkVars和assignskip对象mod？