cookies API 的 onChanged 事件會在 cookie 設定或刪除時觸發。
請注意，更新 cookie 的屬性要透過以下兩個步驟實做：
- 首先，要更新的 cookie 會先被刪掉，並產生一個
overwrite的cookies.OnChangedCause提醒。 - 接著，帶著更新數值的新 cookie 會被寫進去，並產生第二個
explicit的cookies.OnChangedCause提醒。
語法
browser.cookies.onChanged.addListener(listener) browser.cookies.onChanged.removeListener(listener) browser.cookies.onChanged.hasListener(listener)
此 API 也能以 browser.cookies.onChanged.* 運行。
此事件有以下函式：
addListener(callback)- 給此事件添加監聽器（listener）。
removeListener(listener)- 停止監聽此事件。
listener參數是要移除的監聽器。 hasListener(listener)- 檢查此事件的
listener是否被監聽了。若有監聽，回傳true，否則回傳false。
addListener 語法
參數
callback-
能被呼叫的 callback 函式會在此事件發生的時候觸發。函式會 passed 以下參數：
changeInfo- 一個含有觸發事件資訊的
object。它有兩個屬性： -
removed- 一個
boolean。如果 cookie 被刪除則為true，否則為false。 cookie- 一個
cookies.Cookie物件。含有被設定、或被刪除的 cookie 資訊。 cause- 一個
cookies.OnChangedCause數值。含有 cookie被改變的潛在原因。
瀏覽器相容性
本相容性表格由結構化資料產生。若要貢獻資料，請參考 https://github.com/mdn/browser-compat-data 並給一個 pull request。
Update compatibility data on GitHub
| Desktop | Mobile | ||||
|---|---|---|---|---|---|
onChanged | Chrome Full support Yes | Edge Full support 79 | Firefox Full support 45 | Opera Full support Yes | Firefox Android Full support 48 |
Legend
- Full support
- Full support
示例
本範例監聽 onChanged 事件並紀錄由 changeInfo 參數傳來的資訊：
browser.cookies.onChanged.addListener(function(changeInfo) {
console.log('Cookie changed: ' +
'\n * Cookie: ' + JSON.stringify(changeInfo.cookie) +
'\n * Cause: ' + changeInfo.cause +
'\n * Removed: ' + changeInfo.removed);
});
Example extensions
致謝
此 API 基於 Chromium 的 chrome.cookies API 而來，文件改作自 Chromium 程式碼裡的 cookies.json。
Microsoft Edge 的相容資訊來自微軟公司，原文以創用 CC 姓名標示 3.0 美國版條款授權大眾使用。
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