add event listener function in JavaScript | part : 3 | JavaScript for beginners

EVENT LISTENER IN JAVASCRIPT
An event listener is a procedure in JavaScript that waits for an event to occur. The simple example of an event is a user clicking the mouse or pressing a key on the keyboard.

How do you check if there is an EventListener?
Right-click on the search icon button and choose “inspect” to open the Chrome developer tools. Once the dev tools are open, switch to the “Event Listeners” tab and you will see all the event listeners bound to the element. You can expand any event listener by clicking the right-pointing arrowhead.

Can you add multiple event listener in JavaScript?
You can add many event handlers to one element. You can add many event handlers of the same type to one element, i.e two "click" events. You can add event listeners to any DOM object not only HTML elements. i.e the window object.
How do event listeners work?
Often an event listener is registered with the object that generates the event. When the event occurs, the object iterates through all listeners registered with it informing them of the event.
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