ドットインストール - 3分動画でマスターできるプログラミング学習サービス

main.js

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'use strict';
{
    const target = document.querySelector('img');
    function callback(entries){
        console.log(entries[0]);
    }
    const options = {
        threshold: 0.2,
    }
    const observer = new IntersectionObserver(callback, options);
    observer.observe(target);
}
 
 
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