在您试图拉入第一幅图像的页面模板上（如果是帖子本身，那么是single.php），您可以使用以下代码而不是\\u post\\u缩略图

function echo_first_image( $postID ) {
$args = array(
    \'numberposts\' => 1,
    \'order\' => \'ASC\',
    \'post_mime_type\' => \'image\',
    \'post_parent\' => $postID,
    \'post_status\' => null,
    \'post_type\' => \'attachment\',
);

$attachments = get_children( $args );

if ( $attachments ) {
    foreach ( $attachments as $attachment ) {
        $image_attributes = wp_get_attachment_image_src( $attachment->ID, \'thumbnail\' )  ? wp_get_attachment_image_src( $attachment->ID, \'thumbnail\' ) : wp_get_attachment_image_src( $attachment->ID, \'full\' );

        echo \'<img src="\' . wp_get_attachment_thumb_url( $attachment->ID ) . \'" class="current">\';
    }
}
}