what is the use of addeventlistener in javascript code example

Example 1: js addeventlistener

document.getElementById("example").addEventListener('click', function() {
  alert('Click');
});

Example 2: javascript addeventlistener

var element = document.getElementById("#id");
element.addEventListener('click', function(){
	console.log("click");
});

Example 3: js addeventlistener

var element=document.getElementById("some_id");
var listener=element.addEventListener('click',function(event){                          
            
 });

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Javascript Example

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