About Lesson
JavaScript in <head>
<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Paragraph changed.";
}
</script>
</head>
<body>
<h2>Demo JavaScript in Head</h2>
<p id="demo">A Paragraph</p>
<button type="button" onclick="myFunction()">Try it</button>
</body>
</html>
JavaScript in <body>
<!DOCTYPE html>
<html>
<body>
<h2>Demo JavaScript in Body</h2>
<p id="demo">A Paragraph</p>
<button type="button" onclick="myFunction()">Try it</button>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Paragraph changed.";
}
</script>
</body>
</html>
External JS
<!DOCTYPE html> <html> <body> <h2>Demo External JavaScript</h2> <p id="demo">A Paragraph.</p> <button type="button" onclick="myFunction()">Try it</button> <p>This example links to "myScript.js".</p> <p>(myFunction is stored in "myScript.js")</p> <script src="myScript.js"></script> </body> </html>
FILE JS
function myFunction() {
document.getElementById("demo").innerHTML = "Paragraph changed.";
}