当前位置：文江博客知识库 en-US 文档 Web API StorageManager persist

StorageManager.persist() - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The persist() method of the StorageManager interface requests permission to use persistent storage, and returns a Promise that resolves to true if permission is granted and box mode is persistent, and false otherwise.

Syntax

navigator.storage.persist().then(function(persistent) { ... })

Parameters

None.

Return value

A Promise that resolves to a Boolean.

Example

if (navigator.storage && navigator.storage.persist)
  navigator.storage.persist().then(function(persistent) {
    if (persistent)
      console.log("Storage will not be cleared except by explicit user action");
    else
      console.log("Storage may be cleared by the UA under storage pressure.");
  });