Javascript onclick example

How to create JavaScript click example at the image?

Example:

<img src="images/fl1.jpg" alt="Anything learn">

    <script>

       var anyImg = document.querySelector('img');

      // console.log(anyImg);

       anyImg.onclick = function(){

           var anySrc = anyImg.getAttribute('src');

           if(anySrc === 'images/fl1.jpg'){

            anyImg.setAttribute('src','images/fl2.jpg');

           }

           else{

            anyImg.setAttribute('src','images/fl1.jpg');

           }

       }

    </script>