Thêm nhiều lớp CSS vào các phần tử HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Adding multiple Classes to the Elements in jQuery</title>
<style>
.page-header{
color: red;
text-transform: uppercase;
}
.highlight{
background: yellow;
}
.hint{
font-style: italic;
}
</style>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1").addClass("page-header highlight");
});
});
</script>
</head>
<body>
<h1>Hello World</h1>
<p>The quick brown fox jumps over the lazy dog.</p>
<button type="button">Add Class</button>
</body>
</html>
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