Hàm alert() trong JavaScript

http://sinhviencntt.net/hoc-javascript-bai-6-cac-ham-xuat-du-lieu-trong-javascript/

by sinhviencntt

HTML

<!DOCTYPE html>
<html>
<head>
</head>
<body>
    <h1>Hello JavaScript</h1>
    <script>
        alert("SinhVienCNTT.Net");
    </script>
</body>
</html>