将下面的代码复制粘贴到主题的functions.php文件的最后面，然后保存文件。

// 禁用自动生成的图片尺寸
function shapeSpace_disable_image_sizes($sizes) {
unset($sizes['thumbnail']);    // disable thumbnail size
unset($sizes['medium']);       // disable medium size 
unset($sizes['large']);        // disable large size 
unset($sizes['medium_large']); // disable medium-large size 
unset($sizes['1536x1536']);    // disable 2x medium-large size 
unset($sizes['2048x2048']);    // disable 2x large size return $sizes;
}
add_action('intermediate_image_sizes_advanced', 'shapeSpace_disable_image_sizes');
// 禁用缩放尺寸
add_filter('big_image_size_threshold', '__return_false');
// 禁用其他图片尺寸
function shapeSpace_disable_other_image_sizes() {
remove_image_size('post-thumbnail'); // disable images added via set_post_thumbnail_size()  remove_image_size('another-size');   // disable any other added image sizes
}
add_action('init', 'shapeSpace_disable_other_image_sizes');
再次上传图片，就会发现只有原图，不会再生成任何其他版本了。