你是说这样的事？

当您单击“添加曲目”时，它会变成：

如果您的意思是its通过创建一个元盒来完成，该元盒具有简单的jquery函数来添加和删除其中的字段，并且数据保存为单个元行中的数据数组，那么您可以：

  add_action( \'add_meta_boxes\', \'dynamic_add_custom_box\' );

    /* Do something with the data entered */
    add_action( \'save_post\', \'dynamic_save_postdata\' );

    /* Adds a box to the main column on the Post and Page edit screens */
    function dynamic_add_custom_box() {
        add_meta_box(
            \'dynamic_sectionid\',
            __( \'My Tracks\', \'myplugin_textdomain\' ),
            \'dynamic_inner_custom_box\',
            \'post\');
    }

    /* Prints the box content */
    function dynamic_inner_custom_box() {
        global $post;
        // Use nonce for verification
        wp_nonce_field( plugin_basename( __FILE__ ), \'dynamicMeta_noncename\' );
        ?>
        <div id="meta_inner">
        <?php

        //get the saved meta as an array
        $songs = get_post_meta($post->ID,\'songs\',false);

        $c = 0;
        if ( count( $songs ) > 0 ) {
            foreach( $songs as $track ) {
                if ( isset( $track[\'title\'] ) || isset( $track[\'track\'] ) ) {
                    printf( \'<p>Song Title <input type="text" name="songs[%1$s][title]" value="%2$s" /> -- Track number : <input type="text" name="songs[%1$s][track]" value="%3$s" /><span class="remove">%4$s</span></p>\', $c, $track[\'title\'], $track[\'track\'], __( \'Remove Track\' ) );
                    $c = $c +1;
                }
            }
        }

        ?>
    <span id="here"></span>
    <span class="add"><?php _e(\'Add Tracks\'); ?></span>
    <script>
        var $ =jQuery.noConflict();
        $(document).ready(function() {
            var count = <?php echo $c; ?>;
            $(".add").click(function() {
                count = count + 1;

                $(\'#here\').append(\'<p> Song Title <input type="text" name="songs[\'+count+\'][title]" value="" /> -- Track number : <input type="text" name="songs[\'+count+\'][track]" value="" /><span class="remove">Remove Track</span></p>\' );
                return false;
            });
// The live() method was deprecated in jQuery version 1.7, and removed in version 1.9. Use the on() method instead. We can use .on
            $(".remove").live(\'click\', function() {
                $(this).parent().remove();
            });
        });
        </script>
    </div><?php

    }

    /* When the post is saved, saves our custom data */
    function dynamic_save_postdata( $post_id ) {
        // verify if this is an auto save routine. 
        // If it is our form has not been submitted, so we dont want to do anything
        if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) 
            return;

        // verify this came from the our screen and with proper authorization,
        // because save_post can be triggered at other times
        if ( !isset( $_POST[\'dynamicMeta_noncename\'] ) )
            return;

        if ( !wp_verify_nonce( $_POST[\'dynamicMeta_noncename\'], plugin_basename( __FILE__ ) ) )
            return;

        // OK, we\'re authenticated: we need to find and save the data

        $songs = $_POST[\'songs\'];

        update_post_meta($post_id,\'songs\',$songs);
    }