有点晚了，但您也可以将以下内容添加到主题的功能中。php文件：

    /** Comment Form Function Defaults */
    add_filter(\'comment_form_defaults\',\'my_comment_defaults\');
    function my_comment_defaults($defaults) {
        global $user_identity, $id;
        if ( isset($post_id) )
            $id = $post_id;
        else
            $post_id = $id;
        $commenter = wp_get_current_commenter();
        $req = get_option( \'require_name_email\' );
        $aria_req = ( $req ? " aria-required=\'true\'" : \'\' );
        $fields =  array(
            \'author\' => \'<div class="comment-form-author">\' . \'<label for="author">\' . __( \'Name:\' ) . ( $req ? \' <span class="required">*</span>\' : \'\' ) .
                        \'</label><input id="author" name="author" type="text" value="\' . esc_attr( $commenter[\'comment_author\'] ) . \'" size="30"\' . $aria_req . \' /></div>\',
            \'email\'  => \'<div class="comment-form-email"><label for="email">\' . __( \'Email:\' ) . ( $req ? \' <span class="required">*</span>\' : \'\' ) .
                        \'</label><input id="email" name="email" type="text" value="\' . esc_attr(  $commenter[\'comment_author_email\'] ) . \'" size="30"\' . $aria_req . \' /></div>\',
            \'url\'    => \'\',
        );
        $required_text = sprintf( \' \' . __(\'Required fields are marked %s\'), \'<span class="required">*</span>\' );
        $defaults = array(
            \'fields\'               => apply_filters( \'comment_form_default_fields\', $fields ),
            \'comment_field\'        => \'<div class="comment-form-comment"><label for="comment">\' . _x( \'Comment:\', \'noun\' ) . \' <span class="required">*</span></label><textarea id="comment" name="comment" cols="45" rows="8" aria-required="true"></textarea></div>\',
            \'must_log_in\'          => \'<p class="must-log-in">\' .  sprintf( __( \'You must be <a href="%s">logged in</a> to post a comment.\' ), wp_login_url( apply_filters( \'the_permalink\', get_permalink( $post_id ) ) ) ) . \'</p>\',
            \'logged_in_as\'         => \'<p class="logged-in-as">\' . sprintf( __( \'Logged in as <a href="%1$s">%2$s</a>. <a href="%3$s" title="Log out of this account">Log out?</a>\' ), admin_url( \'profile.php\' ), $user_identity, wp_logout_url( apply_filters( \'the_permalink\', get_permalink( $post_id ) ) ) ) . \'</p>\',
            \'comment_notes_before\' => \'<p class="comment-notes"><em>Note: </em>\' . __( \'Your email address will not be published.\' ) . ( $req ? $required_text : \'\' ) . \'</p>\',
            \'comment_notes_after\'  => \'<p class="form-allowed-tags">\' . sprintf( __( \'You may use these <abbr title="HyperText Markup Language">HTML</abbr> tags and attributes: %s\' ), \' <code>\' . allowed_tags() . \'</code>\' ) . \'</p>\',
            \'id_form\'              => \'commentform\',
            \'id_submit\'            => \'submit\',
            \'title_reply\'          => __( \'Leave a Reply\' ),
            \'title_reply_to\'       => __( \'Leave a Reply to %s\' ),
            \'cancel_reply_link\'    => __( \'Cancel reply\' ),
            \'label_submit\'         => __( \'Post Comment\' ),
        );
        return $defaults;
    }