Javascript document.cookie 总是空字符串
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Javascript document.cookie always empty string
提问by Menztrual
I have this real strange problem with client side javascript setting cookies. I'm developing a little 1 page demo at the moment to use cookies to store some 'preferences'. Please note that I can't use a server side language for this demo or any 3rd party jQuery plugins.
我在客户端 javascript 设置 cookie 时遇到了这个真正奇怪的问题。我目前正在开发一个小小的 1 页演示，以使用 cookie 来存储一些“首选项”。请注意，我不能在此演示或任何 3rd 方 jQuery 插件中使用服务器端语言。
So I've written a javascript object to set a cookie:
所以我写了一个 javascript 对象来设置 cookie：
var cookie = {
set: function (name,value,exdays) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + exdays);
var value = escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
document.cookie=name + "=" + value;
console.log(document.cookie);
}
}
cookie.set('foo','bar',2);
console.log(document.cookie);
It just returns an empty string. I've gone into Chrome console to see if I can do it via directly modifying document.cookie
它只返回一个空字符串。我已经进入Chrome控制台，看看是否可以通过直接修改来完成document.cookie
> document.cookie = "foo=bar";
"foo=bar"
> document.cookie
""
How do you set a cookie via client side javascript?
你如何通过客户端javascript设置cookie？
Edit: I am not in incognito mode and cookies are enabled.
编辑：我没有处于隐身模式并且启用了 cookie。
回答by Stijn de Witt
HttpOnly cookies cannot be accessed from Javascript and session cookies are usually set as HttpOnly cookies. See also this StackOverflow question: How to read a secure cookie using JavaScript
无法从 Javascript 访问 HttpOnly cookie，会话 cookie 通常设置为 HttpOnly cookie。另请参阅此 StackOverflow 问题： How to read a secure cookie using JavaScript
So... check whether the cookie you want to read has the 'HttpOnly' flag set... If so, you know the culprit. It's not a bug, it's a feature!
所以...检查您要读取的 cookie 是否设置了 'HttpOnly' 标志...如果是，您就知道罪魁祸首了。这不是一个错误，这是一个功能！
回答by Menztrual
You can't set cookies by the look of things if its not running in a web server.
如果 cookie 不在 Web 服务器中运行，则无法通过外观设置 cookie。
file:///C:/Users/me/Desktop/demo/demo.html
file:///C:/Users/me/Desktop/demo/demo.html
however:
然而：
http://localhost/demo/demo.htmlworks.
http://localhost/demo/demo.html作品。
回答by Aram Kocharyan
For usage and docs, see here:
有关用法和文档，请参见此处：
https://developer.mozilla.org/en-US/docs/DOM/document.cookie
https://developer.mozilla.org/en-US/docs/DOM/document.cookie
If you are in Incognito Modeor have cookies disabled, it won't work.
如果您处于隐身模式或禁用 cookie，它将无法工作。
回答by poida
This worked for me when ran from localhost, running chrome 28.0.1472.0 canary:
当从本地主机运行时，这对我有用，运行 chrome 28.0.1472.0 canary：
<!DOCTYPE html>
<html>
<head>
<title>localhost cookie</title>
</head>
<body>
<script type="text/javascript">
console.log(document.cookie);
var myCookie = "mycookie=hellocookie";
document.cookie = myCookie;
</script>
</body>
</html>
Run it in a server, visit the page and look at your cookie store, refresh the page and look at your console.
在服务器中运行它，访问页面并查看您的 cookie 存储，刷新页面并查看您的控制台。
It did not set a cookie when opened as a file but worked every time when opened from the server.
它在作为文件打开时没有设置 cookie，但每次从服务器打开时都可以工作。
