How to add event listener in javascript

In Javascript, there are a lot of events such as :

• click
• dblclick
• mouseenter
• mouseleave
• mousemove

and  there are three ways to assign events to HTML elements:

• Inline event handlers
• Event handler properties
• Event listeners

I will show you how to add onclick event in javascript using Inline event handlers 

example

<button onclick="alert(Date())">What the time is?</button>