因此，对于，我添加了一些自定义图像大小，如下所示：

add_action(\'after_setup_theme\', \'image_sizes_setup\');
    function image_sizes_setup(){
      add_theme_support( \'post-thumbnails\' );

      add_image_size(\'thumb-small-2x\', 196, 9999);
      add_image_size(\'thumb-medium-2x\', 276, 9999);
      add_image_size(\'portrait-thumb-large-2x\', 328, 9999);
      add_image_size(\'landscape-thumb-large-2x\', 9999, 328);
      add_image_size(\'small-2x\', 900, 600);
      add_image_size(\'medium-2x\', 1200, 800);
      add_image_size(\'large\', 1920, 1280);
      add_image_size(\'large-large-2x\', 2160, 1440);
      add_image_size(\'extra-large-2x\', 2400, 1600);
    }

然后我编写了这段代码，以便在媒体管理器中选择它们

add_filter( \'image_size_names_choose\', \'custom_image_sizes_choose\' );
    function custom_image_sizes_choose( $sizes ) {
        $custom_sizes = array(
            \'thumb-small-2x\' => \'Thumb Small\',
            \'thumb-medium-2x\' => \'Thumb Medium\',
            \'portrait-thumb-large-2x\' => \'Thumb Portrait Large\',
            \'landscape-thumb-large-2x\' => \'Thumb Landscape Large\',
            \'small-2x\' => \'Small\',
            \'medium-2x\' => \'Medium\',
            \'large\' => \'Large\',
            \'large-large-2x\' => \'Large Large\',
            \'extra-large-2x\' => \'Extra Large\',
        );
        return array_merge( $sizes, $custom_sizes );
    }

我将它显示在我的一个模板中

add_action(\'genesis_after_header\', \'ts_show_featured_image\');
    function ts_show_featured_image(){
      if ( has_post_thumbnail()):
          echo\'<div class="gallery header-image">\';
          the_post_thumbnail( \'extra-large-2x\', array( \'class\' => \'featured-image\' ) );
          echo \'</div>\';
      endif;
    }

img标记的html用作：

<img
  width="2400"
  height="1600"
  src="http://example.com/wp-content/uploads/2016/04/Picture-6.jpg"
  class="featured-image wp-post-image"
  alt="Picture"
  srcset="
    http://example.com/wp-content/uploads/2016/04/Picture.jpg 2400w,
    http://example.com/wp-content/uploads/2016/04/Picture-768x512.jpg 768w,
    http://example.com/wp-content/uploads/2016/04/Picture-276x184.jpg 276w,
    http://example.com/wp-content/uploads/2016/04/Picture-328x219.jpg 328w,
    http://example.com/wp-content/uploads/2016/04/Picture-492x328.jpg 492w,
    http://example.com/wp-content/uploads/2016/04/Picture-900x600.jpg 900w,
    http://example.com/wp-content/uploads/2016/04/Picture-1200x800.jpg 1200w"
  sizes="(max-width: 2400px) 100vw, 2400px"
>

所以一切都应该是这样的，只是2160x1440和1920x1280图像不在srcset中。它们的纵横比与其他所有缩略图相同（不包括缩略图，但这些都是无关紧要的。我甚至对缩略图大小和重新生成的缩略图进行了注释，以确保存在相同的问题）。

我试着做得很彻底，如果你需要更多信息，请告诉我。非常感谢！这快把我逼疯了。

So any ideas why they aren\'t showing up?

add_filter(\'max_srcset_image_width\', function($max_srcset_image_width, $size_array){
    return 2000;
}, 10, 2);