I am getting console.log($(this).attr('src')) as undefined. I want to modify src attribute of all img 
  elements in loop.
$(document).ready(function() {
  $("#btn1").click(() => {
    $(".images").each(() => {
      console.log($(this).attr('src')); // getting undefined
      var srcText = $(this).attr('src');
      var srcArr = srcText.split('?').split('?');
      srcArr[srcArr.length - 1] = genRandQuery();
      $(this).attr('src', srcArr.join('?'));
    });
  });
  function genRandQuery() {
    return 'rnd=' + Math.random().toString(36).substr(7);
  }
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>
<img class="images" src="https://abc?rnd=1234">
<img class="images" src="https://abc?rnd=2354">
<img class="images" src="https://abc?rnd=9876">
<button id="btn1">Show Text</button> 
    