public function wp_title($title, $sep, $location){
        if( !empty($this->title) ){
            $array = [$this->title];
            $sep = ' '.trim($sep).' ';
            if( 'right' == $location ){
                $array[] = $sep;
            }else{
                array_unshift($array, $sep);
            }
            $title = implode('', $array);
        }
        return $title;
    }