Fires when a theme supplied as a browser extension is applied or removed. Specifically:
theme.update()
or
theme.reset()
Note that this event is not fired for changes to the built-in themes.
browser.theme.onUpdated.addListener(listener)
browser.theme.onUpdated.removeListener(listener)
browser.theme.onUpdated.hasListener(listener)
Events have three functions:
addListener(listener)
Adds a listener to this event.
removeListener(listener)
Stop listening to this event. The
listener
argument is the listener to remove.
hasListener(listener)
校验是否
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:
updateInfo
对象
. An object containing two properties:
theme
对象
. If the event fired because an extension-supplied theme was removed, this will be an empty object. If it fired because an extension-supplied theme was applied, then it will be a
theme.Theme
object representing the theme that was applied.
windowId
可选
integer
. The ID of the window for which theme has been updated. If this property is not present, it means that the theme was updated globally.
BCD tables only load in the browser
function handleUpdated(updateInfo) {
if (updateInfo.theme.colors) {
console.log(`Theme was applied: ${updateInfo.theme}`);
} else {
console.log(`Theme was removed`);
}
}
browser.theme.onUpdated.addListener(handleUpdated);
最后修改： , 由 MDN 贡献者