谢谢all@ValentinGenev我选择了这个选项，但我完全是新手，所以我必须学习WP更多，以便跟随你的领导。我在我的主题（extras.php）中发现了这一点：

    if ( $child_theme_support == \'default\' ) {
        $categories_list = get_the_category_list(esc_html__(\', \', \'blossom-fashion-pro\'));
    }else{
        $categories_list = get_the_category_list(esc_html__(\' \', \'blossom-fashion-pro\'));

    }       

    if ($categories_list) {
        echo \'<span class="cat-links" itemprop="about">\' . $categories_list . \'</span>\';
    }
}
}
endif;

$categories = get_the_category();
$category_name = \'foo1\'; // set this to the category name you want to show
$output = \'\';
if($categories){
foreach($categories as $category) 
{
        if ( $category_name == $category->cat_name) 
       {
              $output .=\'<div class="category-custom-class">\'.$category->cat_name.\'</div>\';
       }
       else
       {
             $output .=\'<div class="category-custom-class1">\'.$category->cat_name.\'</div>\';
       }
}
echo $output;
}