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]);
        if (entries[0].isIntersecting){
            target.classList.add('appear');
        }else {
            target.classList.remove('appear');
        }
    }
    const options = {
        threshold :0.2,
    };
    const observer = new IntersectionObserver(callback,options);
    observer.observe(target);
}
 
 
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