如何在 Chrome 扩展中删除事件监听器

2022-01-15 00:00:00 events google-chrome-extension event-handling javascript

我正在尝试在发出请求后删除 chrome.extension.onRequest.addListener 添加的 onRequest 侦听器，如下所示:

I am trying to remove the onRequest listener added by chrome.extension.onRequest.addListener after a request is made, like this:

chrome.extension.onRequest.addListener(
    function(request){
        chrome.extension.onRequest.removeListener();
        other_function(request);
    }
);

问题是我不知道这是否有效.我尝试了 chrome.extension.onRequest.hasListener，这似乎没有给出正确的答案，所以我想知道是否还有其他方法可以删除 onRequest 侦听器或检查监听器是否存在.

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 onRequest listener or check if the listener exists or not.

谢谢！

推荐答案

removeListener 接受一个参数.您需要命名监听函数，然后按名称将其删除:

removeListener takes an argument. You need to name the listener function and then remove it by name:

function doStuff(request){
    chrome.extension.onRequest.removeListener(doStuff);
    other_function(request);
}
chrome.extension.onRequest.addListener(doStuff);

或者，更简洁:

chrome.extension.onRequest.addListener(
    function doStuff(request){
        chrome.extension.onRequest.removeListener(doStuff);
        other_function(request);
    }
);

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