Set the value of the rel attribute to nofollow
:
document.getElementById("myAnchor").rel = "nofollow";
Click the button to set the value of the rel attribute of the link to nofollow
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<!DOCTYPE html> <html> <body> <p><a id="myAnchor" href="https://www.java2s.com">Examples</a></p> <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() {//w w w . j av a2 s. com document.getElementById("myAnchor").rel = "nofollow"; document.getElementById("demo").innerHTML = "The value of the rel attribute of the link changed."; } </script> </body> </html>