Let’s see the same example of displaying alert dialog box of JavaScript that is contained inside the head tag.
In this example, we are creating a function msg(). To create function in JavaScript, you need to write function with function_name as given below.
To call function, you need to work on event. Here we are using onclick event to call msg() function.
<html>
<head>
<script type="text/javascript">
function msg(){
alert("Hello Javatpoint");
}
</script>
</head>
<body>
<p>Welcome to JavaScript</p>
<form>
<input type="button" value="click" onclick="msg()"/>
</form>
</body>
</html>
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