public function start_el(&$output, $item, $depth = 0, $args = null, $id = 0)
{
    if (isset($args->item_spacing) && 'discard' === $args->item_spacing) {
        $t = '';
        $n = '';
    } else {
        $t = "\t";
        $n = "\n";
    }
    $indent = ($depth) ? str_repeat($t, $depth) : '';

    $classes = empty($item->classes) ? array() : (array) $item->classes;
    $classes[] = 'nav-item';
    $classes[] = 'menu-item-' . $item->ID;

    // 处理下拉菜单
    if (in_array('menu-item-has-children', $classes)) {
        $classes[] = 'dropdown';
        $classes[] = 'dmenu';
        
        // 如果是三级菜单，添加子菜单类
        if ($depth == 1) {
            $classes[] = 'dropdown-submenu';
        }
    }

    /**
     * Filters the arguments for a single nav menu item.
     *
     * @since 4.4.0
     *
     * @param stdClass $args  An object of wp_nav_menu() arguments.
     * @param WP_Post  $item  Menu item data object.
     * @param int      $depth Depth of menu item. Used for padding.
     */
    $args = apply_filters('nav_menu_item_args', $args, $item, $depth);

    /**
     * Filters the CSS classes applied to a menu item's list item element.
     *
     * @since 3.0.0
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param array    $classes The CSS classes that are applied to the menu item's `<li>` element.
     * @param WP_Post  $item    The current menu item.
     * @param stdClass $args    An object of wp_nav_menu() arguments.
     * @param int      $depth   Depth of menu item. Used for padding.
     */
    $class_names = join(' ', apply_filters('nav_menu_css_class', array_filter($classes), $item, $args, $depth));
    $class_names = $class_names ? ' class="' . esc_attr($class_names) . '"' : '';

    /**
     * Filters the ID applied to a menu item's list item element.
     *
     * @since 3.0.1
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param string   $menu_id The ID that is applied to the menu item's `<li>` element.
     * @param WP_Post  $item    The current menu item.
     * @param stdClass $args    An object of wp_nav_menu() arguments.
     * @param int      $depth   Depth of menu item. Used for padding.
     */
    $id = apply_filters('nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args, $depth);
    $id = $id ? ' id="' . esc_attr($id) . '"' : '';

    $output .= $indent . '<li' . $id . $class_names . '>';

    $atts = array();
    $atts['title'] = !empty($item->attr_title) ? $item->attr_title : '';
    $atts['target'] = !empty($item->target) ? $item->target : '';
    $atts['rel'] = !empty($item->xfn) ? $item->xfn : '';
    $atts['href'] = !empty($item->url) ? $item->url : '';
    $atts['class'] = 'nav-link';

    // 处理下拉菜单链接
    if (in_array('menu-item-has-children', $item->classes)) {
        $atts['class'] .= ' dropdown-toggle';
        $atts['data-toggle'] = 'dropdown';
        $atts['role'] = 'button';
        $atts['aria-haspopup'] = 'true';
        $atts['aria-expanded'] = 'false';
    }

    /**
     * Filters the HTML attributes applied to a menu item's anchor element.
     *
     * @since 3.6.0
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param array    $atts {
     *     The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
     *
     *     @type string $title  Title attribute.
     *     @type string $target Target attribute.
     *     @type string $rel    The rel attribute.
     *     @type string $href   The href attribute.
     * }
     * @param WP_Post  $item  The current menu item.
     * @param stdClass $args  An object of wp_nav_menu() arguments.
     * @param int      $depth Depth of menu item. Used for padding.
     */
    $atts = apply_filters('nav_menu_link_attributes', $atts, $item, $args, $depth);

    $attributes = '';
    foreach ($atts as $attr => $value) {
        if (is_scalar($value) && '' !== $value && false !== $value) {
            $value = ('href' === $attr) ? esc_url($value) : esc_attr($value);
            $attributes .= ' ' . $attr . '="' . $value . '"';
        }
    }

    /** This filter is documented in wp-includes/post-template.php */
    $title = apply_filters('the_title', $item->title, $item->ID);

    /**
     * Filters a menu item's title.
     *
     * @since 4.4.0
     *
     * @param string   $title The menu item's title.
     * @param WP_Post  $item  The current menu item.
     * @param stdClass $args  An object of wp_nav_menu() arguments.
     * @param int      $depth Depth of menu item. Used for padding.
     */
    $title = apply_filters('nav_menu_item_title', $title, $item, $args, $depth);

    $item_output = $args->before;
    $item_output .= '<a' . $attributes . '>';
    $item_output .= $args->link_before . $title . $args->link_after;
    $item_output .= '</a>';
    $item_output .= $args->after;

    /**
     * Filters a menu item's starting output.
     *
     * The menu item's starting output only includes `$args->before`, the opening `<a>`,
     * the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is
     * no filter for modifying the opening and closing `<li>` for a menu item.
     *
     * @since 3.0.0
     *
     * @param string   $item_output The menu item's starting HTML output.
     * @param WP_Post  $item        Menu item data object.
     * @param int      $depth       Depth of menu item. Used for padding.
     * @param stdClass $args        An object of wp_nav_menu() arguments.
     */
    $output .= apply_filters('walker_nav_menu_start_el', $item_output, $item, $depth, $args);
}<br />
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{"id":345,"date":"2026-07-22T16:14:23","date_gmt":"2026-07-22T08:14:23","guid":{"rendered":"https:\/\/www.huaiyesucheng.com\/?p=345"},"modified":"2026-07-22T16:14:23","modified_gmt":"2026-07-22T08:14:23","slug":"t09","status":"publish","type":"post","link":"https:\/\/www.huaiyesucheng.com\/ar\/t09\/","title":{"rendered":"T09"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-327 aligncenter\" src=\"http:\/\/www.huaiyesucheng.com\/wp-content\/uploads\/2026\/07\/T09.jpg\" alt=\"\" width=\"600\" height=\"500\" srcset=\"https:\/\/www.huaiyesucheng.com\/wp-content\/uploads\/2026\/07\/T09.jpg 600w, https:\/\/www.huaiyesucheng.com\/wp-content\/uploads\/2026\/07\/T09-300x250.jpg 300w, https:\/\/www.huaiyesucheng.com\/wp-content\/uploads\/2026\/07\/T09-14x12.jpg 14w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; background-color: #f9f9f9; border: 1px solid #ddd;\">\n<thead>\n<tr style=\"background-color: #2a5298; color: #ffffff; text-align: left;\">\n<th style=\"padding: 12px 15px; border: 1px solid #ddd; font-weight: bold;\">Parameter<\/th>\n<th style=\"padding: 12px 15px; border: 1px solid #ddd; font-weight: bold;\">Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Driving Mode<\/td>\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Gravity action<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f6f9;\">\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Product Dimensions<\/td>\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">1700 \u00d7 880 \u00d7 1630 mm<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Wooden Crate Size<\/td>\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">1870 \u00d7 915 \u00d7 550 mm<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f6f9;\">\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Max User Weight<\/td>\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">180 kg<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Net Weight<\/td>\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">135 kg<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f6f9;\">\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">Gross Weight<\/td>\n<td style=\"padding: 10px 15px; border: 1px solid #ddd;\">165 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>Parameter Specification Driving Mode Gravity action Product Dimensions 1700 \u00d7 880 \u00d7 1630 mm Wooden Crate Size 1870 \u00d7 915 \u00d7 550 mm Max User Weight 180 kg Net Weight 135 kg Gross Weight 165 kg<\/p>","protected":false},"author":1,"featured_media":327,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6,2,11],"tags":[],"class_list":["post-345","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aerobic","category-products","category-unpowered-treadmill"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/posts\/345","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/comments?post=345"}],"version-history":[{"count":1,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/posts\/345\/revisions"}],"predecessor-version":[{"id":346,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/posts\/345\/revisions\/346"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/media\/327"}],"wp:attachment":[{"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/media?parent=345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/categories?post=345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.huaiyesucheng.com\/ar\/wp-json\/wp\/v2\/tags?post=345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}