可以使用过滤器以干净的PHP方式删除内联宽度，如源代码所述：https://core.trac.wordpress.org/browser/trunk/src/wp-includes/media.php#L1587

返回零（或false）将删除它：

add_filter( \'img_caption_shortcode_width\', \'__return_false\' );

可以使用“！important”替代内联样式，如下所示：

width: 100px !important;

add_shortcode(\'wp_caption\', \'fixed_img_caption_shortcode\');
add_shortcode(\'caption\', \'fixed_img_caption_shortcode\');
function fixed_img_caption_shortcode($attr, $content = null) {
    if ( ! isset( $attr[\'caption\'] ) ) {
        if ( preg_match( \'#((?:<a [^>]+>\\s*)?<img [^>]+>(?:\\s*</a>)?)(.*)#is\', $content, $matches ) ) {
        $content = $matches[1];
        $attr[\'caption\'] = trim( $matches[2] );
        }
    }

    $output = apply_filters(\'img_caption_shortcode\', \'\', $attr, $content);
    if ( $output != \'\' )
    return $output;

    extract(shortcode_atts(array(
        \'id\' => \'\',
        \'align\' => \'alignnone\',
        \'width\' => \'\',
        \'caption\' => \'\'
    ), $attr));

    if ( 1 > (int) $width || empty($caption) )
    return $content;

    if ( $id ) $id = \'id="\' . esc_attr($id) . \'" \';

    return \'<div \' . $id . \'class="wp-caption \' . esc_attr($align) . \'" style="width: \' . $width . \'px">\' . do_shortcode( $content ) . \'<p>\' . $caption . \'</p></div>\';
}

$(".wp-caption").removeAttr(\'style\');