how to know when a button is press in javascript code example

Example 1: 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');
});

Example 2: how to check if the button is clicked or not in javascript

if(document.getElementbyId("id do item").clicked == true){
	window.alert("ok")   
}