<!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>Document</title>
<script src="http://code.jquery.com/jquery.js"></script>
</head>
<body>
<h1>Hello jQuery</h1>
<script>
// jQuery 라이브러리에 새 기능 추가(플러그인)
$.fn.changeColor = function(color, callback){
this.css({'color': color});
callback(this);
}
</script>
<script>
$('h1').changeColor('red', function(target){
alert('적용 완료');
});
</script>
</body>
</html>