JavaScript/dom7.html at main · sudeepnagar/JavaScript · GitHub

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<!DOCTYPE html>
<html lang="em">
<head>
      <script>
	    const sum=function(x=0,y=0,z=0){//default params
		     return x+y+z;
		}
	  </script>
	  <title>DOM</title>
</head>
<body>
  <h3>demo on element object (events)</h3>
  <button id="bt1">Push here </button>
  <button id="bt2"> Pull here </button>

<hr>
     <script>
         const b1=document.querySelector("#bt1");
		 b1.addEventListener("click", function(){
		                                alert("hey, why ur pushed me");
										} );

		const b2=document.querySelector("#bt2");
		//b2.onclick=function(){alert("oooey, why ur pulling me");}

		b2.onmouseover=function(){alert("oooey, why ur pulling me");}

		</script>
</body>
</html>