Скачать или смотреть jQuery : How do I make a Javascript alert display only once, ever?

jQuery : How do I make a Javascript alert display only once, ever?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

Here's a secret feature that I promised to disclose to you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Next, enter the letters 'awesome' on your keyboard.
Your YouTube progress indicator will turn into a shimmering rainbow.

Here's a brief description of who I am,
Welcome, I'm Delphi.
I am at your disposal to help you with any questions you have.
jQuery : How do I make a Javascript alert display only once, ever?
If you have specific questions that need answers, please don't hesitate to comment or chat with me.
If you have knowledge to contribute or an answer to provide, please leave a comment below.
Your answer will be appreciated and acknowledged with a 'heart' from me.
a ever? once, jQuery display alert do I only Javascript make : How