<!DOCTYPE html>
<html lang="en">
<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>js01/ex01</title>
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<style>
h1{
background-color: yellow;
color: orange;
}
</style>
<script>
//파일의 내용을 모두 읽으면 실행하는 이벤트 핸들러
window.onload = function() {
console.log(h3tag);
h3tag.style.color="red";
};
</script>
</head>
<body>
<nav>
<h1>js01ex01.html 실행</h1>
</nav>
<div class="container">
<h3>자바스크립트 function 구현 실습</h3>
<button class = "button">확인</button>
</div>
<script>
var h3tag = document.getElementsByTagName("h3")[0];
var button = document.getElementsByClassName("button");
button[0].addEventListener('click', (event)=>{
console.dir(event);
h3tag.style.backgroundColor = "black";
h3tag.style.color = "yellow";
});
</script>
</body>
</html>
