javascript - 如何更新 Chrome 扩展中的 onBeforeRequest 事件监听器？

Question

我在后台页面中有一个带有以下事件监听器的扩展...

chrome.webRequest.onBeforeRequest.addListener(
    function(details){
        if ( ... details.url is in ArrayOfURLs ...  ){
            ... do stuff ...
        }
    }, {
        urls:  ["<all_urls>"],
        types: ["main_frame"]
    }, ["blocking"]
);

我想要做的就是首先将 url 数组传递给事件监听器。所以它应该看起来像这样......

chrome.webRequest.onBeforeRequest.addListener(
    function(details){
        ... do stuff ...
    }, {
        urls:  ArrayOfURLs,
        types: ["main_frame"]
    }, ["blocking"]
);

当我从 ArrayOfURLs 数组中添加/删除项目时，有没有办法更新事件监听器？

Answer 1

常见的做法是删除旧的处理程序并添加新的处理程序。

function requestHandler(details){
  /* ... do stuff ... */
}

function setListener(ArrayOfURLs) {
  chrome.webRequest.onBeforeRequest.removeListener(requestHandler);
  chrome.webRequest.onBeforeRequest.addListener(
    requestHandler,
    { urls: ArrayOfURLs, types: ["main_frame"] },
    ["blocking"]
  );
  chrome.webRequest.handlerBehaviorChanged();
}

需要最后一次调用，因为 Chrome 缓存了规则，但它是 very expensive in terms of performance .