<body>
        <a id="link">링크</a>
        <img id="image" />
        <input type="text" id="input" />
        <script src="index.js"></script>

       
    </body>
//setAttribute : html 요소 속성 추가
const link = document.getElementById('link'); //여기선 속성이 없음
link.setAttribute('href', 'https://www.naver.com/');
const img = document.getElementById('image');
img.setAttribute('src', 'img.jpg');
img.setAttribute('width', '200');
const input = document.getElementById('input');
input.setAttribute('placeholder', '이름을 입력하세요.');
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