Apenas substitua a saídapadrão. Certifique-se de desenescar otrecho antes deenviá-lopara oeditor:

 add_action( 'add_meta_boxes', array ( 'T5_Richtext_Excerpt', 'switch_boxes' ) );

/**
 * Replaces the default excerpt editor with TinyMCE.
 */
class T5_Richtext_Excerpt
{
    /**
     * Replaces the meta boxes.
     *
     * @return void
     */
    public static function switch_boxes()
    {
        if ( ! post_type_supports( $GLOBALS['post']->post_type, 'excerpt' ) )
        {
            return;
        }

        remove_meta_box(
            'postexcerpt' // ID
        ,   ''            // Screen, empty to support all post types
        ,   'normal'      // Context
        );

        add_meta_box(
            'postexcerpt2'     // Reusing just 'postexcerpt' doesn't work.
        ,   __( 'Excerpt' )    // Title
        ,   array ( __CLASS__, 'show' ) // Display function
        ,   null              // Screen, we use all screens with meta boxes.
        ,   'normal'          // Context
        ,   'core'            // Priority
        );
    }

    /**
     * Output for the meta box.
     *
     * @param  object $post
     * @return void
     */
    public static function show( $post )
    {
    ?>
        <label class="screen-reader-text" for="excerpt"><?php
        _e( 'Excerpt' )
        ?></label>
        <?php
        // We use the default name, 'excerpt', so we don’t have to care about
        // saving, other filters etc.
        wp_editor(
            self::unescape( $post->post_excerpt ),
            'excerpt',
            array (
            'textarea_rows' => 15
        ,   'media_buttons' => FALSE
        ,   'teeny'         => TRUE
        ,   'tinymce'       => TRUE
            )
        );
    }

    /**
     * The excerpt is escaped usually. This breaks the HTML editor.
     *
     * @param  string $str
     * @return string
     */
    public static function unescape( $str )
    {
        return str_replace(
            array ( '&lt;', '&gt;', '&quot;', '&amp;', '&nbsp;', '&amp;nbsp;' )
        ,   array ( '<',    '>',    '"',      '&',     ' ', ' ' )
        ,   $str
        );
    }
}
 

Salveeste códigoem umplugin ouno seutema functions.php.

Just replace the default output. Make sure you unescape the excerpt before you send it to the editor:

add_action( 'add_meta_boxes', array ( 'T5_Richtext_Excerpt', 'switch_boxes' ) );

/**
 * Replaces the default excerpt editor with TinyMCE.
 */
class T5_Richtext_Excerpt
{
    /**
     * Replaces the meta boxes.
     *
     * @return void
     */
    public static function switch_boxes()
    {
        if ( ! post_type_supports( $GLOBALS['post']->post_type, 'excerpt' ) )
        {
            return;
        }

        remove_meta_box(
            'postexcerpt' // ID
        ,   ''            // Screen, empty to support all post types
        ,   'normal'      // Context
        );

        add_meta_box(
            'postexcerpt2'     // Reusing just 'postexcerpt' doesn't work.
        ,   __( 'Excerpt' )    // Title
        ,   array ( __CLASS__, 'show' ) // Display function
        ,   null              // Screen, we use all screens with meta boxes.
        ,   'normal'          // Context
        ,   'core'            // Priority
        );
    }

    /**
     * Output for the meta box.
     *
     * @param  object $post
     * @return void
     */
    public static function show( $post )
    {
    ?>
        <label class="screen-reader-text" for="excerpt"><?php
        _e( 'Excerpt' )
        ?></label>
        <?php
        // We use the default name, 'excerpt', so we don’t have to care about
        // saving, other filters etc.
        wp_editor(
            self::unescape( $post->post_excerpt ),
            'excerpt',
            array (
            'textarea_rows' => 15
        ,   'media_buttons' => FALSE
        ,   'teeny'         => TRUE
        ,   'tinymce'       => TRUE
            )
        );
    }

    /**
     * The excerpt is escaped usually. This breaks the HTML editor.
     *
     * @param  string $str
     * @return string
     */
    public static function unescape( $str )
    {
        return str_replace(
            array ( '&lt;', '&gt;', '&quot;', '&amp;', '&nbsp;', '&amp;nbsp;' )
        ,   array ( '<',    '>',    '"',      '&',     ' ', ' ' )
        ,   $str
        );
    }
}

Save this code in a plugin or in your theme’s functions.php.

Umamaneira simples é usar oplugin Rich Text Excerpt

Oplug-in usa o WP_Editor Funçãoparagerar umeditor detexto ricoparapage/póstrechos,então sófuncionaráno WordPress 3.3 oumaior.

A simple way is to use the plugin Rich Text Excerpt

The Plugin uses the wp_editor function to generate a rich text editor for page/post excerpts, so will only work in WordPress 3.3 or greater.

Vocêpodeprecisar usar afunção wp_editor para obtereditor rico,então você deve remover quaisquerfunções sanitizar com get_post_meta (ou update_post_meta ),Então você deve usar htmlspecialchars_decode funçãopara obter o conteúdo rico ..

  add_action ('add_meta_boxes','adding_a_new_metabox');
Função adding_a_new_metabox ()
    {
        add_meta_box ('html_myid_31_section','Title Hellooo','my_output_funct');
    }

funçãomy_output_funct ($post)
    {
//Então,nãonedpara usaresc_attrnafrente deget_post_meta
    $ Valueeee2=get_post_meta ($ _get ['post'],'smth_metaname',true);
    wp_editor (htmlspecialchars_decode ($ valueeee2),'mettaabox_id_stylee',$ settings=array ('textarea_name'=> 'myinputnamee'));
    }


Função SEVE_MY_POST_DATA ($post_id)
{
    Se (! vazio ($ _postar ['myinputnamee']))
        {
        $ DATTA=HTMLSpecialChars ($ _ Post ['MyInputnamee']);
        update_post_meta ($post_id,'smth_metaname',$ DATTA);
        }
}
add_action ('save_post','save_my_post_data');