Window.localStorage

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句法
范例
规范
浏览器兼容性
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只读 localStorage property allows you to access a 存储 对象为 Document 's origin ; the stored data is saved across browser sessions. localStorage 类似于 sessionStorage , except that while data stored in localStorage has no expiration time, data stored in sessionStorage gets cleared when the page session ends — that is, when the page is closed. (Data in a localStorage object created in a "private browsing" or "incognito" session is cleared when the last "private" tab is closed.)

Data stored in either localStorage is specific to the protocol of the page . In particular, data stored by a script on a site accessed with HTTP (e.g., http://example.com ) is put in a different localStorage object from the same site accessed with HTTPS (e.g., https://example.com ).

The keys and the values are always in the UTF-16 DOMString format, which uses two bytes per character. As with objects, integer keys are automatically converted to strings.

句法

myStorage = window.localStorage;

值

A 存储 object which can be used to access the current origin's local storage space.

异常

SecurityError: The request violates a policy decision, or the origin is not a valid scheme/host/port tuple (this can happen if the origin uses the 文件： or data: scheme, for example). For example, the user may have their browser configured to deny permission to persist data for the specified origin.

范例

The following snippet accesses the current domain's local 存储 object and adds a data item to it using Storage.setItem() .

localStorage.setItem('myCat', 'Tom');

The syntax for reading the localStorage item is as follows:

const cat = localStorage.getItem('myCat');

The syntax for removing the localStorage item is as follows:

localStorage.removeItem('myCat');

The syntax for removing all the localStorage items is as follows:

localStorage.clear();

注意 : Please refer to the 使用 Web 存储 API article for a full example.

规范

规范	状态	注释
HTML 实时标准 The definition of 'localStorage' in that specification.	实时标准

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
`localStorage`	Chrome 4	Edge 12	Firefox 3.5	IE 8	Opera 10.5	Safari 4	WebView Android ≤37	Chrome Android 18	Firefox Android 4	Opera Android 11	Safari iOS 3.2	Samsung Internet Android 1.0

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句法

值

异常

范例

规范

浏览器兼容性

图例

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元数据

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