This function removes all items from the store.
If there are no items in the store in the first place, that is still counted as a success.
clear( successCallback, errorCallback )
| Name | Type | Description | 
| successCallback | sap.EncryptedStorage~successCallback | If successful, the successCallback is invoked with no parameters. | 
| errorCallback | sap.EncryptedStorage~errorCallback | If there is an error, the errorCallback is invoked with an ErrorInfo object as the parameter. | 
var store = new sap.EncryptedStorage("storeName", "storePassword");
var successCallback = function() {
   alert("Store cleared!");
}
var errorCallback = function(error) {
   alert("An error occurred: " + JSON.stringify();
}
store.clear(successCallback, errorCallback);