我发现您可以通过此属性手动设置可用性按钮theme_advanced_buttons1 （用于第1行的按钮）

示例：

function disable_mce_buttons( $opt ) {
    //set button that will be show in row 1
    $opt[\'theme_advanced_buttons1\'] = \'bold,italic,strikethrough,|,bullist,numlist,blockquote,|,justifyleft,justifycenter,justifyright,|,link,unlink,wp_more,|,spellchecker,wp_fullscreen,wp_adv,separator\';
    return $opt;
}

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