javascript 如何在 Chrome 扩展程序中删除事件侦听器
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How to remove event listener in Chrome extension
提问by chaohuang
I am trying to remove the onRequestlistener added by chrome.extension.onRequest.addListenerafter a request is made, like this:
我正在尝试删除在发出请求后onRequest添加的侦听器chrome.extension.onRequest.addListener，如下所示：
chrome.extension.onRequest.addListener(
function(request){
chrome.extension.onRequest.removeListener();
other_function(request);
}
);
The problem is that I don't know if this works or not. I tried chrome.extension.onRequest.hasListener, which seems not to give the right answer, so I am wondering if there are some other ways to remove the onRequestlistener or check if the listener exists or not.
问题是我不知道这是否有效。我试过chrome.extension.onRequest.hasListener，这似乎没有给出正确的答案，所以我想知道是否有其他方法可以删除onRequest侦听器或检查侦听器是否存在。
Thanks!
谢谢！
回答by apsillers
removeListenertakes an argument. You need to name the listener function and then remove it by name:
removeListener需要一个论点。您需要命名侦听器函数，然后按名称将其删除：
function doStuff(request){
chrome.extension.onRequest.removeListener(doStuff);
other_function(request);
}
chrome.extension.onRequest.addListener(doStuff);
Or, more succinctly:
或者，更简洁地说：
chrome.extension.onRequest.addListener(
function doStuff(request){
chrome.extension.onRequest.removeListener(doStuff);
other_function(request);
}
);
回答by Prakash GPz
Another simple and straight forward approach when using anonymous functions:
使用匿名函数时的另一种简单直接的方法：
chrome.runtime.onMessage.addListener(function(msg, sender, reply) {
chrome.runtime.onMessage.removeListener(arguments.callee);
});
