域级Cookie

古城微笑少年丶 2022-12-07 12:09 156阅读 0赞

Web sites often have a **www.** sub-domain that points to the same content as the main domain. With [session cookies][] our visitor has either accessed our site with the **www.** or they have accessed it without and so the fact that a cookie created for **www.example.com** is not accessible from **example.com** isn't going to matter. With first-party cookies, a visitor may very easily access our site the first time as **www.example.com** and the second time as **example.com** and so we want to create a cookie that will be accessible from both.

网站通常都有**www。** 指向与主域相同内容的子域。 通过[会话cookie，][session cookies]我们的访客可以通过**www**访问我们的网站**。** 或他们没有访问过它，因此从**example.com**无法访问为**www.example.com**创建的cookie的事实将变得无关紧要。 有了第一方Cookie，访问者可以很容易地第一次以**www.example.com**的身份访问我们的网站，而第二次以**example.com的**身份访问我们的网站，因此我们希望创建一个可以从两者访问的cookie。

## 创建域级Cookie **(** Creating a Domain Level Cookie **)** ##

To make a cookie accessible from the entire domain including any sub-domains we just add a domain parameter when setting the cookie as demonstrated in this [JavaScript][] example. You should, of course, substitute your own domain name for example.com (as example.com is a domain name specifically reserved for use in examples where it represents whatever domain name you are really using.)

为了使cookie可以从整个域(包括任何子域)访问，我们只需在设置cookie时添加一个domain参数，如本[JavaScript][]示例所示。 当然，您应该用自己的域名代替example.com(因为example.com是专门保留用于示例中的域名，在该示例中它代表您实际使用的任何域名。)

writeCookie = function(cname, cvalue, days) {
        
    var dt, expires;
    dt = new Date();
    dt.setTime(dt.getTime()+(days*24*60*60*1000));
    expires = "; expires="+dt.toGMTString();
    document.cookie = cname+"="+cvalue+expires+'; domain=example.com'

> 翻译自: [https://www.thoughtco.com/javascript-by-example-2037272][https_www.thoughtco.com_javascript-by-example-2037272]

[session cookies]: https://www.thoughtco.com/javascript-by-example-updating-cookies-2037276
[JavaScript]: https://www.thoughtco.com/what-is-javascript-2037921
[https_www.thoughtco.com_javascript-by-example-2037272]: https://www.thoughtco.com/javascript-by-example-2037272