The function

addEventListener

creates the specified event listener for the object. In this case we add

click

event for the div element with id

div_element

without using anonymous function. First we select the object that we want to create

click

event listener to

let div = document.getElementById('div_element');

Then we create the actual event listener for the event without anonymous function

div.addEventListener('click', func);
function func() {
    alert('You clicked me!');
}

The same example using anonymous function

div.addEventListener('click', function(){
  alert('You clicked me!');
})

HTML part of the examples:

<div id="div_element">Click Me</div>

Another method to add the event listener is to include

onclick

attribute inside opening tag

<div onclick="func()">Click Me</div>