Before starting an example let us discuss how JavaScript can display the data.
JavaScript ways of data display:
1. window.alert(): Display data in an alert box.
2. document.write(): Display data into the HTML output.
3. innerHTML: Display data into an HTML element.
4. console.log(): Display data into the browser console.
Javascript in head tag example:
<html>
<head>
<script type="text/javascript">
alert("Hello w3schools.com");
</script>
</head>
</html>
<html>
<head>
<script type="text/javascript">
alert("Hello w3schools.com");
</script>
</head>
</html>
<html>
<head>
<script type="text/javascript">
alert("Hello w3schools.com");
</script>
</head>
</html>
Try it:
<html>
<html>
<html>
Javascript in body tag example:
<body>
<script type="text/javascript">
alert("Hello w3schools.com");
</script>
</body>
</html>
<body>
<script type="text/javascript">
alert("Hello w3schools.com");
</script>
</body>
</html>
<body>
<script type="text/javascript">
alert("Hello w3schools.com");
</script>
</body>
</html>
Try it:
Javascript in head and body tag example:
<html>
<head>
<script type="text/javascript">
function sayHello(){
alert("Hello w3schools.com");
}
</script>
</head>
<body>
<p>Hello World Javascript Example.</p>
<form>
<input type="button" value="Say Hello" onclick="sayHello()"/>
</form>
</body>
</html>
<html>
<head>
<script type="text/javascript">
function sayHello(){
alert("Hello w3schools.com");
}
</script>
</head>
<body>
<p>Hello World Javascript Example.</p>
<form>
<input type="button" value="Say Hello" onclick="sayHello()"/>
</form>
</body>
</html>
<html>
<head>
<script type="text/javascript">
function sayHello(){
alert("Hello w3schools.com");
}
</script>
</head>
<body>
<p>Hello World Javascript Example.</p>
<form>
<input type="button" value="Say Hello" onclick="sayHello()"/>
</form>
</body>
</html>