This API is available on Firefox OS for internal applications 仅。
clear()
方法在
DataStore
interface deletes all records from the data store, leaving it empty.
注意 : The Data Store API is available in Web 工作者 , from Firefox 32 onwards (Firefox OS 2.0; see bug 949325 )。
store.clear().then(function(success) {
// Do something with success, which is a boolean
// reporting whether the deletion was successful or not
A
Promise
object of type void that resolves with boolean reporting whether the deletion was successful or not.
revisionId
revisionId
(
DOMString
). This can be used to prevent conflicts. If the
revisionId
is not the current
revisionId
for the current Data Store, the operation is aborted. This means that the developer has a 'old'
revisionId
and will have to manage the conflict somehow.
The following example gets all the data stores on the device called "contacts", then deletes all the content in the first "contacts" data store:
navigator.getDataStores('contacts').then(function(stores) {
stores[0].clear.then(function(success) {
if(success) {
console.log('Contacts successfully cleared.');
};
});
});
| 规范 | 状态 | 注释 |
|---|---|---|
|
Data Store API
The definition of 'clear()' in that specification. |
草案 |
The discussion concerning this API's creation happened in various Mozilla mailing lists and other places. A summary of the discussion and further pointers can be found on the Mozilla Wiki . For further feedback and questions, send mail to the dev-webapi mailing list.