我也有同样的问题，下面是你能做的。下面的代码禁用块格式部分中的h1标记。同样，您可以禁用其他标记，也可以添加自己的标记。但我不确定如何为它们添加自定义CSS样式。希望这段代码能提示您以何种方式进行挖掘。

//Modify TinyMCE editor to hide H1. 
function tiny_mce_remove_unused_formats( $initFormats ) {
    // Add block format elements you want to show in dropdown
    $initFormats[\'block_formats\'] = \'Paragraph=p;Heading 2=h2;Heading 3=h3;Heading 4=h4;Heading 5=h5;Heading 6=h6;Preformatted=pre\';
    return $initFormats;
}
add_filter( \'tiny_mce_before_init\', \'tiny_mce_remove_unused_formats\' );

你正在寻找的东西在Wordpress 3.9发布之前是可能的。早些时候，您必须编写这些代码行才能使之成为可能。但不幸的是，theme_advanced_styles 已弃用，因为WP 3.9将TinyMCE更新为版本4(see the Change Log). 有关Andrew Ozz blog. <这就是以前的情况(source):

function make_mce_awesome( $init ) {
    // deprecated settings
    $init[\'theme_advanced_blockformats\'] = \'h2,h3,h4,p\';
    $init[\'theme_advanced_disable\'] = \'underline,spellchecker,wp_help\';
    $init[\'theme_advanced_text_colors\'] = \'0f3156,636466,0486d3\';
    $init[\'theme_advanced_buttons2_add\'] = \'styleselect\';
    $init[\'theme_advanced_styles\'] = "bigTitle=bigTitle;Call To Action Button=ctaButton,Rounded Corners=rounded";
    return $init;
}

add_filter(\'tiny_mce_before_init\', \'make_mce_awesome\');

无论如何，我有我的解决方案。您可以摆脱默认下拉列表，添加包含四种样式的格式下拉列表。这将帮助您避免与用户混淆，避免他们从下拉列表中选择样式。

禁用默认下拉列表：

function remove_default_format_select( $buttons ) {
    //Remove the format dropdown select and text color selector
    $remove = array( \'formatselect\' );

    return array_diff( $buttons, $remove );
 }
add_filter( \'mce_buttons\', \'remove_default_format_select\' );

// Callback function to insert \'styleselect\' into the $buttons array
function my_new_mce_buttons( $buttons ) {
    array_unshift( $buttons, \'styleselect\' );
    return $buttons;
}
// Register our callback to the appropriate filter
add_filter( \'mce_buttons\', \'my_new_mce_buttons\' );


// Callback function to filter the MCE settings
function my_mce_before_init_insert_formats( $init_array ) {  
    // Define the style_formats array
    $style_formats = array(
            array(
                \'title\' => \'Headline\',
                \'block\' => \'h1\'
                ),
            array(
                \'title\' => \'SubHeadline\',
                \'block\' => \'h2\'
                ),
            array(
                \'title\' => \'Statement\',
                \'block\' => \'div\',
                \'classes\' => \'statement_class\',
                \'wrapper\' => true
            )
        );
    // Insert the array, JSON ENCODED, into \'style_formats\'
    $init_array[\'style_formats\'] = json_encode( $style_formats );  

    return $init_array;  

} 
// Attach callback to \'tiny_mce_before_init\' 
add_filter( \'tiny_mce_before_init\', \'my_mce_before_init_insert_formats\' );

/**
 * Registers an editor stylesheet for the theme.
 */
function wpdocs_theme_add_editor_styles() {
    add_editor_style( \'custom-editor-style.css\' );
}
add_action( \'admin_init\', \'wpdocs_theme_add_editor_styles\' );