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JavaScript alert()/window.alert() | Alert Dialog Box
The JavaScript alert() method is used to display an alert dialog with an optional message. For example:
HTML with JavaScript Code
<!DOCTYPE html>
<html>
<body>
<h2>The alert() Method</h2>
<button onclick="myFunction()">Click Me to Alert</button>
<script>
function myFunction() {
alert("Hi there!");
}
</script>
</body>
</html>Output
The alert() Method
Note - The alert() is same as window.alert(). It is because, window is a global object. And in JavaScript, a method by default belongs to the window object.
JavaScript alert() Syntax
The syntax of alert() method in JavaScript, is:
alert(message)
The message is optional, used to display some information to the user, regarding the alert box.
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