Fired when one or more items change.
browser.storage.onChanged.addListener(callback)
浏览器
.
storage
.
onChanged
.
removeListener
(
listener
)
浏览器
.
storage
.
onChanged
.
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)
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:
changes
对象
. Object describing the change. This contains one property for each key that changed. The name of the property is the name of the key that changed, and its value is a
storage.StorageChange
object describing the change to that item.
areaName
string
. The name of the storage area (
"sync"
,
"local"
，或
"managed"
) to which the changes were made.
BCD tables only load in the browser
/*
Log the storage area that changed,
then for each item changed,
log its old value and its new value.
*/
function logStorageChange(changes, area) {
console.log("Change in storage area: " + area);
let changedItems = Object.keys(changes);
for (let item of changedItems) {
console.log(item + " has changed:");
console.log("Old value: ");
console.log(changes[item].oldValue);
console.log("New value: ");
console.log(changes[item].newValue);
}
}
browser.storage.onChanged.addListener(logStorageChange);
注意：
This API is based on Chromium's
chrome.storage
API. This documentation is derived from
storage.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