在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

onversionchange event handler of the IDBDatabase interface handles the versionchange event, fired when a database structure change ( IDBOpenDBRequest.onupgradeneeded event or IDBFactory.deleteDatabase ) was requested elsewhere (most probably in another window/tab on the same computer).

This is different from the versionchange transaction (but it is related).

注意： 此特征可用于 Web 工作者 .

句法

IDBDatabase.onversionchange = function(event) { ... }
					

范例

This example shows an IDBOpenDBRequest.onupgradeneeded block that creates a new object store; it also includes onerror and onabort functions to handle non-success cases, and an onversionchange function to notify when a database structure change has occurred.

request.onupgradeneeded = function(event) {
  var db = event.target.result;
  db.onerror = function(event) {
    note.innerHTML += '<li>Error opening database.</li>';
  };
  db.onabort = function(event) {
    note.innerHTML += '<li>Database opening aborted!</li>';
  };
  // Create an objectStore for this database
  var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });
  // define what data items the objectStore will contain
  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });
  objectStore.createIndex("notified", "notified", { unique: false });
  note.innerHTML += '<li>Object store created.</li>';
  db.onversionchange = function(event) {
    note.innerHTML += '<li>a database change has occurred; you should refresh this
                       browser window, or close it down and use the other open version of
                       this application, wherever it exists.</li>';
  };
};
					

规范

规范	状态	注释
索引数据库 API 2.0 The definition of 'onversionchange' in that specification.	推荐
索引数据库 API 草案 The definition of 'onversionchange' in that specification.	推荐

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
onversionchange	Chrome 24 24 23 — 24 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 16 16 10 — 16 Prefixed Prefixed Implemented with the vendor prefix: moz	IE 部分支持 10	Opera 15	Safari 7	WebView Android Yes	Chrome Android 25	Firefox Android 22	Opera Android 14	Safari iOS 8	Samsung Internet Android 1.5

图例

完整支持

完整支持

部分支持

部分支持

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

• 使用 IndexedDB
• 开始事务： IDBDatabase
• 使用事务： IDBTransaction
• 设置一系列键： IDBKeyRange
• 检索并使您的数据改变： IDBObjectStore
• 使用光标： IDBCursor
• 参考范例： 待办通知 ( 实时查看范例 )。
• versionchange event

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. IndexedDB API
2. IDBDatabase
3. 特性

   1. 名称
   2. objectStoreNames
   3. onabort
   4. onclose
   5. onerror
   6. onversionchange
   7. version
4. 方法

   1. close()
   2. createObjectStore()
   3. deleteObjectStore()
   4. transaction()
5. 事件

   1. versionchange
6. 继承：

   1. EventTarget
7. IndexedDB 相关页面

   1. IDBCursor
   2. IDBCursorSync
   3. IDBCursorWithValue
   4. IDBDatabaseException
   5. IDBDatabaseSync
   6. IDBEnvironment
   7. IDBEnvironmentSync
   8. IDBFactory
   9. IDBFactorySync
   10. IDBIndex
   11. IDBIndexSync
   12. IDBKeyRange
   13. IDBObjectStore
   14. IDBObjectStoreSync
   15. IDBOpenDBRequest
   16. IDBRequest
   17. IDBTransaction
   18. IDBTransactionSync
   19. IDBVersionChangeEvent
   20. IDBVersionChangeRequest