Change the port number of a link:
document.getElementById("myAnchor").port = "80";
Click the button to change the port number of the link.
<!DOCTYPE html> <html> <body> <p><a id="myAnchor" target="_blank" href="http://www.java2s.com:1234">Example link</a></p> <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() {/* w ww . j a v a 2s. com*/ document.getElementById("myAnchor").port = "80"; document.getElementById("demo").innerHTML = "The port number was changed to '80'."; } </script> </body> </html>