我在我的函数中添加了缩略图支持。php

// Add Thumbnail Support
add_theme_support(\'post-thumbnails\');
set_post_thumbnail_size( 140, 140, true );

我用

// Create Custom Post Type for Work
add_action( \'init\', \'create_post_type\' );
function create_post_type() {
register_post_type( \'custom_post\',
    array(
        \'thumbnail\',
        \'labels\' => array(
            \'name\' => __( \'Custom\' ),
            \'singular_name\' => __( \'Custom\' )
        ),
        \'public\' => true,
        \'has_archive\' => true,
        \'rewrite\' => array(\'slug\' => \'custom\'),
        \'taxonomies\' => array(\'category\', \'post_tag\')
    )
  );
}

但是，当我在自定义帖子类型中创建新帖子时，不会显示特色图片元框。我还尝试在声明自定义帖子类型时使用数组，如下所示，但这也不起作用

// Add Thumbnail Support
add_theme_support(\'post-thumbnails\', array (\'post\',\'work\',\'custom_post\'));
set_post_thumbnail_size( 140, 140, true );

我错过了什么？

\'supports\' => array( \'thumbnail\' )

\'supports\' => array(\'thumbnail\'),

add_theme_support(\'post-thumbnails\');
add_post_type_support( \'my_product\', \'thumbnail\' );    
function create_post_type() {
        register_post_type( \'my_product\',
            array(
                \'labels\' => array(
                    \'name\' => __( \'Products\' ),
                    \'singular_name\' => __( \'Product\' )
                ),
                \'public\' => true,
                \'has_archive\' => true
            )
        );
    }
    add_action( \'init\', \'create_post_type\' );