好的，使用这个“插件”(JareDatch). 它就像一个符咒。

add_filter( \'cmb_meta_boxes\', \'cmb_sample_metaboxes\' ); /** * Define the metabox and field configurations. ** @param  array $meta_boxes * @return array */ function cmb_sample_metaboxes( array $meta_boxes ) {

// Start with an underscore to hide fields from custom fields list
$prefix = \'_cmb_\';

$meta_boxes[] = array(
    \'id\'         => \'appstore_link\',
    \'title\'      => \'App Store\',
    \'pages\'      => array( \'apps\', ), // Post type
    \'context\'    => \'normal\',
    \'priority\'   => \'high\',
    \'show_names\' => true, // Show field names on the left
    \'fields\'     => array(
        array(
            \'name\' => \'App Store\',
            \'desc\' => \'field description (optional)\',
            \'id\'   => $prefix . \'app_store_link\',
            \'type\' => \'text\',
        ),
    )
);

// Add other metaboxes as needed

return $meta_boxes;}

add_action( \'init\', \'cmb_initialize_cmb_meta_boxes\', 9999 ); function cmb_initialize_cmb_meta_boxes() { 
if ( ! class_exists( \'cmb_Meta_Box\' ) )
    require_once \'init.php\';}

<?php if ( get_post_meta($post->ID, \'_cmb_app_store_link\', true) ) : ?>
                <a href="<?php echo get_post_meta($post->ID, \'_cmb_app_store_link\', true) ?>">
                    <img src="source.png" src="<?php echo get_post_meta($post->ID, \'_cmb_app_store_link\', true) ?>" alt="<?php the_title(); ?>" />
                </a>