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<!DOCTYPE html> <html> <body> <p>This document has an onmousemove event handler that displays a random number every time you move your mouse in this document.</p> <p>Click the button to remove the event handler.</p> <button onclick="removeHandler()">Try it</button> <p><strong>Note:</strong> The addEventListener() and removeEventListener() methods are not supported in Internet Explorer 8 and earlier versions.</p> <p id="demo"></p> <script> document.addEventListener("mousemove", myFunction); function myFunction() { document.getElementById("demo").innerHTML = Math.random(); } function removeHandler() { document.removeEventListener("mousemove", myFunction); } </script> </body> </html>