The alert() is basically a method, which is used to show a pop-up box over the web page.
There are two different syntaxes for showing the alert box. One of them is using the window’s object.
But, we can use the alert() method without the window’s object as well.
So, let’s try both of the syntaxes.
First, let’s try with the window’s object.
And now, without the window’s object.
You will witness that there is no difference in both of them.
The alert method doesn’t only take the string to show the message. We can provide variable as well, and it worked perfectly fine,
as you can see in the screenshot below that the message is displayed.
We have learned about providing a variable as well. What if we want to show the pop-up alert box on the screen at the click of a button? For example, we have got some information from the user, and after successfully saving the user’s data on the server, we want to show a confirmation message that says “Added successfully”. So, we can simply show an alert box like this.
Or, if we are getting a confirmation message from the server, and we want to show the message on the base of the message we got. We can call the function on the button’s onclick method
Then, later in the script, we can write the function in which we can show the alert message.
var alertMessage = 'Alert Box using function';
So, these are some of the different methods of using the alert() method.