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<h4>attr()</h4>
        <a href="https://www.google.com/">이동하기</a>
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<button type="button" onclick="changeAttrJs()">js로 바꾸기</button>
        <button type="button" onclick="changeAttrJquery()">jquery로 바꾸기</button>
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function changeAttrJs() {
    let a = document.querySelector('a');
    a.setAttribute('href', 'https://www.naver.com/');
}
function changeAttrJquery() {
    $('a').attr('href', 'https://velog.io/@sally3921/posts');
}

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