Home > Developer > JavaScript

A brief analysis of JavaScript operation Cookie Object _ Basics

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Cookie Object

is a data information (cookie data) stored in a cookie folder on the client's hard disk in the form of a file (cookies file). The User data information (cookie data) in the cookie folder. The cookie file is established by the Web site visited to hold the session data between the client and the Web site for a long time, and the cookie data is only allowed to be read by the Web site visited. (Cross-domain access is not allowed)

Format of cookie file:

NS:Cookie.txt
IE: User name @ domain. txt

JavaScript Write Cookie

Format:
document.cookie= "keyword = value [; expires= Effective Date] [; ...]"
Note:
Valid date format: Wdy,dd-mon-yy HH:MM:SS
Wdy/mon: English Week/month;
Also contains path, domain, secure attributes;
Each Web site (domain) can create 20 cookie data;
Each browser can store 300 cookie data, 4K bytes;
The customer has a write that prohibits cookie data.

Using JS to manipulate cookies is much more troublesome than using a JSP servlet to manipulate cookies.

Why can't I see the cookie file that holds the session in the cookie folder?

Use two types of cookies

Persistent cookies, which are stored on the client's hard disk.
Session Cookie: It is not stored on the client's hard disk, but in the memory of the browser process, and the session cookie is destroyed when the browser closes.

Copy Code code as follows:

<! DOCTYPE html>
<body>
<script type= "Text/javascript" >
var today=new Date ();

var expireday=new Date ();
var mspermonth=24*60*60*1000*31;
Expireday.settime (Today.gettime () +mspermonth);
Document.cookie= "name=liujl;expires=" +expireday.togmtstring ();
Document.writeln ("Cookies have been written to the hard disk");
Document.writeln ("Content is:" +document.cookie);
Document.writeln ("Expired Time:" +expireday.togmtstring ());
</script>
</body>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
get methods of object javascript javascript check type of object javascript get attributes of object javascript get type of object addition operation in javascript javascript get all properties of object javascript get data type of object
Related Article
The difference between single and double quotes in JavaScript...
Http status code: 301, 302 redirection, 302 redirection
Ajax and 302 response code test_javascript-js tutorial

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More