如何检查选项卡是否已在 background.js 中重新加载？

Question

我正在编写一个 Chrome 扩展程序，它需要检测选项卡是否已重新加载，也就是说，用户刷新了页面（通过按刷新按钮，或者将光标放在 URL 后面并按 Enter）没有网址更改。如果发生这种情况，那么我将重新初始化 background.js 中定义的变量。

我想知道如何获得这个“is_reload”布尔值？我尝试使用windows.performance.navigation.type，但它在background.js中没有任何效果。

Answer 1

使用webNavigation

在后台上下文中的脚本中使用的 API 是webNavigation，用于确定页面实际重新加载的时间，而不仅仅是在页面内更新的 URL 没有导航。您可能需要一个webNavigation.onCommitted 侦听器，这是唯一包含为什么页面正在导航信息的事件（transitionType 和transitionQualifiers），但webNavigation.onDOMContentLoaded 或webNavigation.onCompleted 将也可以，这取决于您的实际需求。

如果您的目标确实是确定它是重新加载，而不仅仅是加载，您将需要记录每个选项卡的当前 URL 并将新 URL 与旧 URL 进行比较，或者使用 @987654328 @ 对象包含在webNavigation.onCommitted 的transitionType 属性中，它将显式声明它为"reload"。

这些是当您通过单击“重新加载此页面”按钮重新加载选项卡时发生的事件：

webNavigation.onBeforeNavigate    ->  arg[0]= {"frameId":0,"parentFrameId":-1,"processId":-1,"tabId":411,"timeStamp":1500401223978.314,"url":"http://www.example.com/"}        
webRequest.onBeforeRequest        ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestId":"260870","tabId":411,"timeStamp":1500401223979.044,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onBeforeSendHeaders    ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestHeaders":[{"name":"Upgrade-Insecure-Requests","value":"1"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"},{"name":"Accept-Encoding","value":"gzip, deflate"},{"name":"Accept-Language","value":"en-US,en;q=0.8"}],"requestId":"260870","tabId":411,"timeStamp":1500401223979.3242,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onSendHeaders          ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestHeaders":[{"name":"Upgrade-Insecure-Requests","value":"1"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"},{"name":"Accept-Encoding","value":"gzip, deflate"},{"name":"Accept-Language","value":"en-US,en;q=0.8"}],"requestId":"260870","tabId":411,"timeStamp":1500401223979.538,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onHeadersReceived      ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestId":"260870","responseHeaders":[{"name":"Content-Encoding","value":"gzip"},{"name":"Accept-Ranges","value":"bytes"},{"name":"Cache-Control","value":"max-age=604800"},{"name":"Content-Type","value":"text/html"},{"name":"Date","value":"Tue, 18 Jul 2017 18:07:03 GMT"},{"name":"Etag","value":"\"359670651\""},{"name":"Expires","value":"Tue, 25 Jul 2017 18:07:03 GMT"},{"name":"Last-Modified","value":"Fri, 09 Aug 2013 23:54:35 GMT"},{"name":"Server","value":"ECS (rhv/818F)"},{"name":"Vary","value":"Accept-Encoding"},{"name":"X-Cache","value":"HIT"},{"name":"Content-Length","value":"606"}],"statusCode":200,"statusLine":"HTTP/1.1 200 OK","tabId":411,"timeStamp":1500401224072.296,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onResponseStarted      ->  arg[0]= {"frameId":0,"fromCache":false,"ip":"93.184.216.34","method":"GET","parentFrameId":-1,"requestId":"260870","responseHeaders":[{"name":"Content-Encoding","value":"gzip"},{"name":"Accept-Ranges","value":"bytes"},{"name":"Cache-Control","value":"max-age=604800"},{"name":"Content-Type","value":"text/html"},{"name":"Date","value":"Tue, 18 Jul 2017 18:07:03 GMT"},{"name":"Etag","value":"\"359670651\""},{"name":"Expires","value":"Tue, 25 Jul 2017 18:07:03 GMT"},{"name":"Last-Modified","value":"Fri, 09 Aug 2013 23:54:35 GMT"},{"name":"Server","value":"ECS (rhv/818F)"},{"name":"Vary","value":"Accept-Encoding"},{"name":"X-Cache","value":"HIT"},{"name":"Content-Length","value":"606"}],"statusCode":200,"statusLine":"HTTP/1.1 200 OK","tabId":411,"timeStamp":1500401224072.5032,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onCompleted            ->  arg[0]= {"frameId":0,"fromCache":false,"ip":"93.184.216.34","method":"GET","parentFrameId":-1,"requestId":"260870","responseHeaders":[{"name":"Content-Encoding","value":"gzip"},{"name":"Accept-Ranges","value":"bytes"},{"name":"Cache-Control","value":"max-age=604800"},{"name":"Content-Type","value":"text/html"},{"name":"Date","value":"Tue, 18 Jul 2017 18:07:03 GMT"},{"name":"Etag","value":"\"359670651\""},{"name":"Expires","value":"Tue, 25 Jul 2017 18:07:03 GMT"},{"name":"Last-Modified","value":"Fri, 09 Aug 2013 23:54:35 GMT"},{"name":"Server","value":"ECS (rhv/818F)"},{"name":"Vary","value":"Accept-Encoding"},{"name":"X-Cache","value":"HIT"},{"name":"Content-Length","value":"606"}],"statusCode":200,"statusLine":"HTTP/1.1 200 OK","tabId":411,"timeStamp":1500401224074.0261,"type":"main_frame","url":"http://www.example.com/"}        
tabs.onUpdated                    ->  arg[0]= 411 :: arg[1]= {"status":"loading","url":"http://www.example.com/"} :: arg[2]= {"active":true,"audible":false,"autoDiscardable":true,"discarded":false,"height":902,"highlighted":true,"id":411,"incognito":false,"index":1,"mutedInfo":{"muted":false},"pinned":false,"selected":true,"status":"loading","title":"www.example.com","url":"http://www.example.com/","width":1282,"windowId":10}    
tabs.onZoomChange                 ->  arg[0]= {"newZoomFactor":1,"oldZoomFactor":1,"tabId":411,"zoomSettings":{"mode":"automatic","scope":"per-origin"}}        
webNavigation.onCommitted         ->  arg[0]= {"frameId":0,"processId":107,"tabId":411,"timeStamp":1500401224079.4019,"transitionQualifiers":[],"transitionType":"reload","url":"http://www.example.com/"}
--->>Here is where you can tell it's a reload --------------------------------------------------------------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^
history.onVisited                 ->  arg[0]= {"id":"42","lastVisitTime":1500401224077.579,"title":"Example Domain","typedCount":1,"url":"http://www.example.com/","visitCount":12}        
tabs.onUpdated                    ->  arg[0]= 411 :: arg[1]= {"title":"Example Domain"} :: arg[2]= {"active":true,"audible":false,"autoDiscardable":true,"discarded":false,"height":902,"highlighted":true,"id":411,"incognito":false,"index":1,"mutedInfo":{"muted":false},"pinned":false,"selected":true,"status":"loading","title":"Example Domain","url":"http://www.example.com/","width":1282,"windowId":10}    
webNavigation.onDOMContentLoaded  ->  arg[0]= {"frameId":0,"processId":107,"tabId":411,"timeStamp":1500401224093.404,"url":"http://www.example.com/"}        
webNavigation.onCompleted         ->  arg[0]= {"frameId":0,"processId":107,"tabId":411,"timeStamp":1500401224094.768,"url":"http://www.example.com/"}        
tabs.onUpdated                    ->  arg[0]= 411 :: arg[1]= {"status":"complete"} :: arg[2]= {"active":true,"audible":false,"autoDiscardable":true,"discarded":false,"height":902,"highlighted":true,"id":411,"incognito":false,"index":1,"mutedInfo":{"muted":false},"pinned":false,"selected":true,"status":"complete","title":"Example Domain","url":"http://www.example.com/","width":1282,"windowId":10}   

以下是用户选择地址栏并点击Enter时的事件：

webNavigation.onBeforeNavigate   ->  arg[0]= {"frameId":0,"parentFrameId":-1,"processId":-1,"tabId":411,"timeStamp":1500403090082.833,"url":"http://www.example.com/"}        
webRequest.onBeforeRequest       ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestId":"261350","tabId":411,"timeStamp":1500403090083.163,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onBeforeSendHeaders   ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestHeaders":[{"name":"Upgrade-Insecure-Requests","value":"1"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"},{"name":"Accept-Encoding","value":"gzip, deflate"},{"name":"Accept-Language","value":"en-US,en;q=0.8"}],"requestId":"261350","tabId":411,"timeStamp":1500403090083.3289,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onSendHeaders         ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestHeaders":[{"name":"Upgrade-Insecure-Requests","value":"1"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"},{"name":"Accept-Encoding","value":"gzip, deflate"},{"name":"Accept-Language","value":"en-US,en;q=0.8"}],"requestId":"261350","tabId":411,"timeStamp":1500403090083.4739,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onHeadersReceived     ->  arg[0]= {"frameId":0,"method":"GET","parentFrameId":-1,"requestId":"261350","responseHeaders":[{"name":"Accept-Ranges","value":"bytes"},{"name":"Cache-Control","value":"max-age=604800"},{"name":"Date","value":"Tue, 18 Jul 2017 18:38:09 GMT"},{"name":"Expires","value":"Tue, 25 Jul 2017 18:38:09 GMT"},{"name":"Last-Modified","value":"Fri, 09 Aug 2013 23:54:35 GMT"},{"name":"Server","value":"ECS (rhv/818F)"},{"name":"Vary","value":"Accept-Encoding"},{"name":"X-Cache","value":"HIT"},{"name":"Content-Encoding","value":"gzip"},{"name":"Content-Type","value":"text/html"},{"name":"Etag","value":"\"359670651\""},{"name":"Content-Length","value":"606"}],"statusCode":200,"statusLine":"HTTP/1.1 200 OK","tabId":411,"timeStamp":1500403090130.209,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onResponseStarted     ->  arg[0]= {"frameId":0,"fromCache":true,"ip":"93.184.216.34","method":"GET","parentFrameId":-1,"requestId":"261350","responseHeaders":[{"name":"Accept-Ranges","value":"bytes"},{"name":"Cache-Control","value":"max-age=604800"},{"name":"Date","value":"Tue, 18 Jul 2017 18:38:09 GMT"},{"name":"Expires","value":"Tue, 25 Jul 2017 18:38:09 GMT"},{"name":"Last-Modified","value":"Fri, 09 Aug 2013 23:54:35 GMT"},{"name":"Server","value":"ECS (rhv/818F)"},{"name":"Vary","value":"Accept-Encoding"},{"name":"X-Cache","value":"HIT"},{"name":"Content-Encoding","value":"gzip"},{"name":"Content-Type","value":"text/html"},{"name":"Etag","value":"\"359670651\""},{"name":"Content-Length","value":"606"}],"statusCode":200,"statusLine":"HTTP/1.1 200 OK","tabId":411,"timeStamp":1500403090130.3289,"type":"main_frame","url":"http://www.example.com/"}        
webRequest.onCompleted           ->  arg[0]= {"frameId":0,"fromCache":true,"ip":"93.184.216.34","method":"GET","parentFrameId":-1,"requestId":"261350","responseHeaders":[{"name":"Accept-Ranges","value":"bytes"},{"name":"Cache-Control","value":"max-age=604800"},{"name":"Date","value":"Tue, 18 Jul 2017 18:38:09 GMT"},{"name":"Expires","value":"Tue, 25 Jul 2017 18:38:09 GMT"},{"name":"Last-Modified","value":"Fri, 09 Aug 2013 23:54:35 GMT"},{"name":"Server","value":"ECS (rhv/818F)"},{"name":"Vary","value":"Accept-Encoding"},{"name":"X-Cache","value":"HIT"},{"name":"Content-Encoding","value":"gzip"},{"name":"Content-Type","value":"text/html"},{"name":"Etag","value":"\"359670651\""},{"name":"Content-Length","value":"606"}],"statusCode":200,"statusLine":"HTTP/1.1 200 OK","tabId":411,"timeStamp":1500403090131.1592,"type":"main_frame","url":"http://www.example.com/"}        
tabs.onUpdated                   ->  arg[0]= 411 :: arg[1]= {"status":"loading"} :: arg[2]= {"active":true,"audible":false,"autoDiscardable":true,"discarded":false,"height":902,"highlighted":true,"id":411,"incognito":false,"index":1,"mutedInfo":{"muted":false},"pinned":false,"selected":true,"status":"loading","title":"Example Domain","url":"http://www.example.com/","width":1282,"windowId":10}    
tabs.onZoomChange                ->  arg[0]= {"newZoomFactor":1,"oldZoomFactor":1,"tabId":411,"zoomSettings":{"mode":"automatic","scope":"per-origin"}}        
webNavigation.onCommitted        ->  arg[0]= {"frameId":0,"processId":107,"tabId":411,"timeStamp":1500403090135.629,"transitionQualifiers":["from_address_bar"],"transitionType":"reload","url":"http://www.example.com/"}        
--->>Here is where you can tell it's a reload ------------------------------------------------------------------------------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^
--->>This tells you it was the user hitting [Enter] in the address bar----------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
history.onVisited                ->  arg[0]= {"id":"42","lastVisitTime":1500403090134.133,"title":"Example Domain","typedCount":1,"url":"http://www.example.com/","visitCount":12}        
webNavigation.onDOMContentLoaded ->  arg[0]= {"frameId":0,"processId":107,"tabId":411,"timeStamp":1500403090144.5688,"url":"http://www.example.com/"}        
webNavigation.onCompleted        ->  arg[0]= {"frameId":0,"processId":107,"tabId":411,"timeStamp":1500403090146.102,"url":"http://www.example.com/"}        
tabs.onUpdated                   ->  arg[0]= 411 :: arg[1]= {"status":"complete"} :: arg[2]= {"active":true,"audible":false,"autoDiscardable":true,"discarded":false,"height":902,"highlighted":true,"id":411,"incognito":false,"index":1,"mutedInfo":{"muted":false},"pinned":false,"selected":true,"status":"complete","title":"Example Domain","url":"http://www.example.com/","width":1282,"windowId":10}    

或者，使用内容脚本告诉后台脚本页面已重新加载

您可以使用在您的manifest.json 中的content_scripts 条目中定义的内容脚本，该脚本被注入到您希望检测的域中是否已加载/重新加载。每次运行内容脚本时，它都可以使用runtime.sendMessage() 向后台脚本（在runtime.onMessage 侦听器中接收）发送一条消息，告诉后台脚本页面已加载/重新加载。

如果您监控的域数量有限，则最好这样做，因为用户在安装扩展程序时收到的警告只会说明扩展程序将有权访问指定的域，而不是所有域。

Answer 2

Makyen 的回答很好！ 只是一些对我有用的代码 sn-p！

// --- On Reloading or Entering example.com --- 
chrome.webNavigation.onCommitted.addListener((details) => {
    if (["reload", "link", "typed", "generated"].includes(details.transitionType) &&
        details.url === "http://example.com/") {

        codeAfterReload();

        chrome.webNavigation.onCompleted.addListener(function onComplete() {

            codeAfterReloadAndFinishSomeLoading();

            chrome.webNavigation.onCompleted.removeListener(onComplete);
        });
    }
});

更多过渡类型： https://developer.chrome.com/docs/extensions/reference/history/#transition_types

享受:)