IDBDatabase.createObjectStore()

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createObjectStore() 方法在 IDBDatabase interface creates and returns a new object store or index.

The method takes the name of the store as well as a parameter object that lets you define important optional properties. You can use the property to uniquely identify individual objects in the store. As the property is an identifier, it should be unique to every object, and every object should have that property.

This method can be called only 在 versionchange transaction.

注意： 此特征可用于 Web 工作者 .

句法

IDBDatabase.createObjectStore(name);
IDBDatabase.createObjectStore(name, options);

参数

名称
optionalParameters 可选

属性	描述
`keyPath`	key path to be used by the new object store. If empty or not specified, the object store is created without a key path and uses out-of-line keys . You can also pass in an array as a `keyPath` .
`autoIncrement`	若 `true` , the object store has a key generator 。默认为 `false` .

新的 IDBObjectStore .

异常

此方法可能引发 DOMException 采用 DOMError of one of the following types:

异常	描述
`InvalidStateError`	Occurs if the method was not called from a `versionchange` transaction callback. For older WebKit browsers, you must call first.
`TransactionInactiveError`	Occurs if a request is made on a source database that doesn't exist (e.g. has been deleted or removed.) In Firefox previous to version 41, an `InvalidStateError` was raised in this case as well, which was misleading; this has now been fixed (see bug 1176165 )。
`ConstraintError`	An object store with the given name (based on case-sensitive comparison) already exists in the connected database.
`I nvalidAccessError`	若 `autoIncrement` is set to true and `keyPath` is either an empty string or an array containing an empty string.

范例

// Let us open our database
var request = window.indexedDB.open("toDoList", 4);
// This handler is called when a new version of the database
// is created, either when one has not been created before
// or when a new version number is submitted by calling
// window.indexedDB.open().
// This handler is only supported in recent browsers.
request.onupgradeneeded = function(event) {
  var db = event.target.result;
  db.onerror = function(event) {
    note.innerHTML += "<li>Error loading database.</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>";
};

规范

规范	状态	注释
索引数据库 API 2.0 The definition of 'createObjectStore()' in that specification.	推荐
索引数据库 API 草案 The definition of 'createObjectStore()' 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
`createObjectStore`	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
部分支持
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 )。

元数据

最后修改： 2020 年 1 月 22 日

IndexedDB API
IDBDatabase
特性
方法
1. close()
2. createObjectStore()
3. deleteObjectStore()
4. transaction()
事件
1. versionchange
继承：
1. EventTarget
IndexedDB 相关页面

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