如何在Chrome中以编程方式撤销持久化存储权限？

Hey there! Great question about reversing persistent storage permissions in Chrome. Let's walk through this step by step.

First, just a quick recap of how you enable persistent storage (since you already shared that code snippet):

if (navigator.storage && navigator.storage.persist) 
  navigator.storage.persist()
  .then(granted => { 
    if (granted) 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."); 
  });

To revoke that persistent storage permission programmatically, you can use the navigator.storage.unpersist() method — it's the direct built-in counterpart to persist(). Here's a working implementation:

if (navigator.storage && navigator.storage.unpersist)
  navigator.storage.unpersist()
  .then(revoked => {
    if (revoked) {
      console.log("Success! Persistent storage permission has been revoked. The browser can now clear this storage when under space pressure.");
    } else {
      console.log("Persistent storage wasn't active for this origin, so no changes were made.");
    }
  });

Key Details to Remember: #

• The unpersist() method returns a promise that resolves to a boolean: true means the permission was successfully revoked, false indicates persistent storage wasn't enabled in the first place.
• This API only works in secure contexts (HTTPS websites, or localhost for local development) — just like the persist() method.
• Revoking persistent storage does not delete any existing stored data; it simply removes the protection against automatic cleanup when the browser is low on storage space.

内容的提问来源于stack exchange，提问作者Lutz