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This div element has an onmousemove event handler that displays a random number every time you move your mouse inside this orange field.
Click the button to remove the div's event handler.
document.getElementById("myDIV").addEventListener("mousemove", myFunction);
function myFunction() {
document.getElementById("demo").innerHTML = Math.random();
}
function removeHandler() {
document.getElementById("myDIV").removeEventListener("mousemove", myFunction);
}