Fired when an update to the extension is available. This event enables an extension to delay an update: for example, because it is in the middle of some operation which should not be interrupted.
If the extension is not listening for this event when an update becomes available, the extension is reloaded immediately and the update is applied. If the extension is listening, then the update will be applied the next time the extension is reloaded. This happens if:
runtime.reload()
.
browser.runtime.onUpdateAvailable.addListener()
browser.runtime.onUpdateAvailable.removeListener(listener)
browser.runtime.onUpdateAvailable.hasListener(listener)
Events have three functions:
addListener(callback)
Adds a listener to this event.
removeListener(listener)
Stop listening to this event. The
listener
argument is the listener to remove.
hasListener(listener)
Checks whether a
listener
is registered for this event. Returns
true
if it is listening,
false
否则。
callback
Function that will be called when this event occurs. The function will be passed the following arguments:
details
对象
. Contains a single property, a string named
version
, which represents the version number of the update.
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Listen for
UpdateAvailable
事件：
function handleUpdateAvailable(details) {
console.log(details.version);
// Proceed to upgrade the add-on
browser.runtime.reload();
}
browser.runtime.onUpdateAvailable.addListener(handleUpdateAvailable);
注意：
This API is based on Chromium's
chrome.runtime
API. This documentation is derived from
runtime.json
in the Chromium code.
Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.
最后修改： , 由 MDN 贡献者