Change the value of the download attribute of a link:
document.getElementById("myAnchor").download = "newValue";
Click the button to change the value of the download attribute of the image link.
<!DOCTYPE html> <html> <body> <a id="myAnchor" href="image1.png" download="flag"> <img border="0" src="image1.png" alt="java2s.com"> </a>/*from w ww .j a v a 2 s. co m*/ <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myAnchor").download = "newValue"; document.getElementById("demo").innerHTML = "download attribute changed"; } </script> </body> </html>