Error on using alert in Javascript (Property 'alert' of object is not a function)

Question

I am just trying to use alert and put a string variable inside the alert and get an error:

Uncaught TypeError: Property \'alert\' of object [Object Window] i         


        

Answer 1

Mozilla says,

The alert function is not actually a part of JavaScript itself.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript

You can not see a function called alert here : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects