jQuery attr() with callback function

Description

jQuery attr() with callback function

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<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>/*from www . ja va 2s . c  o  m*/
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("img").attr("width",function(n, v){
      return v - 50;
    });
  });
});
</script>
</head>
<body>

<img src="image4.png" alt="image4.png" width="284" height="213"><br>

<button>Decrease image width by 50px</button>

</body>
</html>



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