Document.hasStorageAccess()

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这是一个实验中的功能
此功能某些浏览器尚在开发中,请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订,所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

DocumenthasStorageAccess() 方法返回了一个Promise来判断该文档是否有访问第一方储存的权限。

通过 Storage Access API 获取更多信息。

语法

var promise = document.hasStorageAccess();

参数

None.

返回值

一个用来判断文档是否有权利访问其第一方存储的Promise

If the promise gets resolved and a user gesture event was being processed when the function was originally called, the resolve handler will run as if a user gesture was being processed, so it will be able to call APIs that require user activation.

Examples

document.hasStorageAccess().then(hasAccess => {
  if (hasAccess) {
    // storage access has been granted already.
  } else {
    // storage access hasn't been granted already;
    // you may want to call requestStorageAccess().
  }
});

Specifications

The API is currently only at the proposal stage — the standardization process has yet to begin. You can currently find specification details of the API at Apple's Introducing Storage Access API blog post, and WHATWG HTML issue 3338 — Proposal: Storage Access API.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
hasStorageAccess
ExperimentalNon-standard
Chrome No support NoEdge No support NoFirefox Full support 65IE No support NoOpera No support NoSafari Full support 11.1WebView Android No support NoChrome Android No support NoFirefox Android Full support 65
Disabled
Full support 65
Disabled
Disabled From version 65: this feature is behind the dom.storage_access.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 11.3Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

Storage Access API