JavaScript:从该侦听器中删除事件侦听器? [英] JavaScript: remove an event listener from within that listener?

问题描述

我一直想知道这种方法有多干净-从该监听器中删除事件监听器.

I always wondered how clean is such approach - to remove an event listener from within that very listener.

更新:

在内部，我保留对象和侦听器的哈希，因此我可以从任何地方删除事件侦听器.我只是担心要从自身内部删除它.这样的动作真的会起作用吗?

Internally I keep a hash of objects and listeners, so I potentially can remove event listener from any place. I'm just concerned of removing it from within itself. Will such action do a job actually?

更新

我要问的是addEventListener，removeEventListener之类的东西.

I'm asking about addEventListener, removeEventListener stuff.

推荐答案

您可以传递一次选项，以使侦听器仅执行一次操作，然后将其自身删除.文件: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Parameters

You can pass the once option to have a listener act only once, then remove itself. Docs: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Parameters

示例:

  element.addEventListener('eventname', (ev) => {
    console.log("event is captured only once.");
    // do more stuff...
  }, { once: true });

从上面相同的docs链接来看，现代的浏览器支持不错，但Internet Explorer无法使用.

From the same docs link above, modern browser support is good, but is not available for Internet Explorer.

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