为什么没有 removeEventListener 函数？

Question

var mouseListener = button2.addEventListener("mouseover", function (e) {
count++;
...
if(count > 5) button2.removeEventListener("mouseover", mouseListener);
});

I don't why the code doesn't work? How do I use the removeEventListener () in Javascript?

Answer 1

The listener is the function you are passing in the addEventListener function.

var mouseListener = function (e) {
    count++;
    ...
    if ( count > 5 ) {
        button2.removeEventListener("mouseover", mouseListener);
    }
}

button2.addEventListener("mouseover", mouseListener);

Documentation:
https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener