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domainwanjiadongli.com
summaryThe provided text appears to be an excerpt from a tutorial or guide on JavaScript Cookies, rather than a full webpage. Here's a summary based on the given text:

This content discusses the use of JavaScript cookies, which are small pieces of data stored by web browsers and served to the website as part of HTTP requests. They are primarily used for user authentication, tracking user preferences, or storing information about a user's activity within a site.

Key points include:

1. Cookie structure: A cookie is made up of a name-value pair separated by a colon (`key:value`). Multiple cookies can be stored in the browser under a single domain, identified by their unique names.

2. Accessing cookies: In JavaScript, you can access cookies using `document.cookie`, allowing for both reading (retrieving) and writing (setting) cookies. The data is returned as a string, which should then be parsed into objects or an array of objects.

3. Expiration: Cookies have an expiration date (also known as the "lifetime" or "expiry"). After this time, the cookie is removed from the browser's storage and the server cannot access it anymore. You can set an expiration date when creating a cookie using `Date.now()`.

4. Session vs. Persistent cookies:
- Session cookies are deleted once the user closes their browser or ends their session, while persistent cookies remain on the user's device until they expire or are manually deleted.
- Cookies with no expiration (`expires` set to `0`) are considered persistent until they are manually removed.

5. Cookie size and security: The maximum length of a cookie is 4 KB, which may limit its use for storing large amounts of data. Also, cookies can be accessed only by the website that created them, providing some level of security.

6. Best practices:
- Avoid using cookies to store sensitive user information due to potential security risks and privacy concerns.
- Set appropriate expiration dates for cookies to balance functionality and security.
- Respect user preferences regarding cookie usage (e.g., allowing users to opt-out).
titlePlease wait…
descriptionPlease wait…
keywordscookie
upstreams
downstreams
nslookupA 60.13.99.138
created2025-11-10
updated2025-11-10
summarizedNone

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