การวาง JavaScript

JavaScript in Body
JavaScript in Head
External JavaScript

1.JavaScript in Body

<!DOCTYPE html>
<html>

<body>
    <script>
        alert("Hello World!");
    </script>
</body>

</html>

2.JavaScript in Head

<!DOCTYPE html>
<html>

<head>
    <script>
        function myFunction() {
            alert("Hello World!");
        }
    </script>
</head>

<body>

    <button type="button" onclick="myFunction()">Click me</button>

</body>

</html>

3.External JavaScript

<!DOCTYPE html>
<html>

<head>
    <script src="myScript.js"></script>
</head>

<body>

    <button type="button" onclick="myFunction()">Click me</button>

</body>

</html>