영상
개념
<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>getElementsByClassName()</title>
<style>
div {
border: 1px solid black;
}
</style>
</head>
<body>
<div class="content">
<p>getElementsByClassName() 메서드1</p>
</div>
<!-- <div style="background-color: red;" class="content"> -->
<div class="content">
<p>getElementsByClassName() 메서드2</p>
</div>
<script>
let collection = document.getElementsByClassName("content")[1];
// 배경 색상 변경
collection.style.backgroundColor = "red";
</script>
</body>
</html>
Java
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