how to know which button is clicked in javascript code example

Example 1: how to detect a button click in javascript

if(document.getElementById('button').clicked == true)
{
   alert("button was clicked");
}

Example 2: how to check if you click something in javascript

// get the element
const element = document.getElementById('profile_title')

// always checking if the element is clicked, if so, do alert('hello')
element.addEventListener("click", () => {
	alert('hello');
});