private function Get_Four()
 {
     global $templates;
     $content = new ContentModel();
     $object = $content->Index_Four();
     $i = 1;
     foreach ($object as $value) {
         if ($i % 2 == 0) {
             $value->class = 'list right bottom';
         } else {
             $value->class = 'list bottom';
         }
         $content->nav = $value->id;
         $object_list = $content->Index_Four_list();
         $value->list = $object_list;
         foreach ($object_list as $value) {
             $value->title = Tool::Sub_Str($value->title, 20);
             //对title进行截取
             $value->date = date('m-d', strtotime($value->date));
             //将时间格式转换一下
         }
         $i++;
     }
     $templates->assgin('index_four', $object);
 }