function add_lazyload_to_body( $content ) {
if ( is_single() && has_post_thumbnail() ) {
// アイキャッチ画像のHTMLコードを取得
$featured_image = get_the_post_thumbnail( null, 'full' );// bodyタグにlazyload設定を追加
$content = str_replace( '!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e