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>onclick</title>
</head>
<body>
<style>
#my_div {
background: red;
height: 300px;
width: 1000px;
}
</style>
<div id="my_div">
</div>
<input id="clearbtn" type="button" value="clear" />
<div id="result">
</div>
<script type="text/javascript">
let div = document.getElementById("my_div");
let clearbtn = document.getElementById("clearbtn");
let result = document.getElementById("result");
div.addEventListener("mouseenter", (event) => {
result.innerHTML+= "<div>mouseenter</div>";
});
div.addEventListener("mouseleave", (event) => {
result.innerHTML+= "<div>mouseleave</div>";
});
clearbtn.addEventListener("click", (event) => {
result.innerHTML= "";
});
</script>
</body>
</html>
Java
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