javascript 如何删除javascript中的事件侦听器？
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How to remove an event listener in javascript?
提问by FairyQueen
I am wondering how can I remove an event listener after adding one, the way you use on and off in jquery?
我想知道如何在添加事件侦听器后删除事件侦听器，就像您在 jquery 中打开和关闭的方式一样？
document.removeEventListener('touchstart');
document.addEventListener('touchstart', function (e) {
closePopupOnClick(e, popup);
});
but this does not actually remove the event listener. If I put the addEventListener code in a function and pass that function into the the removeEventListener it will not work bc you cannot pass params into the function. Anyone know how to do this?
但这实际上并没有删除事件侦听器。如果我将 addEventListener 代码放在一个函数中并将该函数传递给 removeEventListener 它将不起作用 bc 你不能将参数传递到函数中。有人知道怎么做吗？
回答by Paul S.
Put the listener as a variable and attach via .addEventListener
将侦听器作为变量并附加通过 .addEventListener
var myListener = function (e) {
closePopupOnClick(e, popup);
};
document.addEventListener('touchstart', myListener, true);
then pass it again when removing with .removeEventListener
然后在删除时再次传递它 .removeEventListener
document.removeEventListener('touchstart', myListener);
If you're notin strict mode you can make a listener remove itself with arguments.callee
如果你不是在严格模式下，你可以让一个监听器移除自己arguments.callee
document.addEventListener('touchstart', function (e) {
closePopupOnClick(e, popup);
document.removeEventListener('touchstart', arguments.callee);
}, true);
If you are in strict mode, you have to use a named function expressionif you want a function to remove itself
如果你在严格模式下，如果你想要一个函数删除自己，你必须使用一个命名的函数表达式
document.addEventListener('touchstart', function myListener(e) {
closePopupOnClick(e, popup);
document.removeEventListener('touchstart', myListener);
}, true);
If you want to use variables in the listener that may be changed by something (e.g. a loop), then you can write a generator function, for instance
如果你想在监听器中使用可能被某些东西（例如循环）改变的变量，那么你可以编写一个生成器函数，例如
function listenerGenerator(popup) {
return function (e) {
closePopupOnClick(e, popup);
};
}
Now you can create the listener with listenerGenerator(popup)and it will scope the popupvariable. Note that if popupis an Object, it will be ByRefand therefore may still be subject to changes.
现在您可以使用listenerGenerator(popup)它创建侦听器，它将作用域popup变量。请注意，如果popup是Object，它将是ByRef，因此可能仍会发生变化。
