value
只读特性在
IDBCursorWithValue
interface returns the value of the current cursor, whatever that is.
var value = myIDBCursorWithValue.value;
The value of the current cursor.
In this example we create a transaction, retrieve an object store, then use a cursor to iterate through all the records in the object store. Within each iteration we log the value of the cursor with
cursor.value
.
T
he cursor does not require us to select the data based on a key; we can just grab all of it. Also note that in each iteration of the loop, you can grab data from the current record under the cursor object using
cursor.value.foo
. For a complete working example, see our
IDBCursor example
(
实时查看范例
)。
function displayData() {
var transaction = db.transaction(['rushAlbumList'], "readonly");
var objectStore = transaction.objectStore('rushAlbumList');
objectStore.openCursor().onsuccess = function(event) {
var cursor = event.target.result;
if(cursor) {
var listItem = document.createElement('li');
listItem.innerHTML = cursor.value.albumTitle + ', ' + cursor.value.year;
list.appendChild(listItem);
console.log(cursor.value);
cursor.continue();
} else {
console.log('Entries all displayed.');
}
};
};
| 规范 | 状态 | 注释 |
|---|---|---|
|
索引数据库 API 2.0
The definition of 'source' in that specification. |
推荐 | |
|
索引数据库 API 草案
在该规范中的 IDBDatabase 定义。 |
推荐 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
value
|
Chrome
24
|
Edge 12 |
Firefox
16
|
IE 部分支持 10 | Opera 15 | Safari 7 | WebView Android Yes | Chrome Android Yes | Firefox Android 22 | Opera Android 14 | Safari iOS 8 | Samsung Internet Android Yes |
完整支持
部分支持
要求使用供应商前缀或不同名称。
IDBDatabase
IDBTransaction
IDBKeyRange
IDBObjectStore
IDBCursor
IDBCursorWithValue
value
IDBCursor
IDBCursorSync
IDBDatabase
IDBDatabaseException
IDBDatabaseSync
IDBEnvironment
IDBEnvironmentSync
IDBFactory
IDBFactorySync
IDBIndex
IDBIndexSync
IDBKeyRange
IDBObjectStore
IDBObjectStoreSync
IDBOpenDBRequest
IDBRequest
IDBTransaction
IDBTransactionSync
IDBVersionChangeEvent
IDBVersionChangeRequest