这个script_loader_tag 版本4.1中添加的过滤器解决了此问题。要向排队脚本添加异步属性，可以执行以下操作：

/**
 * Add an aysnc attribute to an enqueued script
 * 
 * @param string $tag Tag for the enqueued script.
 * @param string $handle The script\'s registered handle.
 * @return string Script tag for the enqueued script
 */
function namespace_async_scripts( $tag, $handle ) {
    // Just return the tag normally if this isn\'t one we want to async
    if ( \'your-script-handle\' !== $handle ) {
        return $tag;
    }
    return str_replace( \' src\', \' async src\', $tag );
}
add_filter( \'script_loader_tag\', \'namespace_async_scripts\', 10, 2 );

更多信息可通过文章获取»Add Defer & Async Attributes to WordPress Scripts«由Matthew Horne和开发商参考script_loader_tag.