IE can not set the short domain name Cookie_javascript skills

The cookie Setup failed after some simple troubleshooting and found the problem.

But as for why failed, this problem check for a long time, and finally in the stackoverflow above someone mentioned, ie from 5.0 can not be a short domain name under the cookie set.

So how short will there be problems? After testing, it was found that a total of 5 characters, including dots, would not be able to set cookies through JavaScript, but there is a prerequisite that you explicitly specify the domain parameter when you set up the cookie to fail. Which means if you write this:

View source code Printing help document.cookie= "key=value;domain=ab.cn";

The cookie setting fails, and if you remove the domain parameter, write it directly:

View source code Printing help document.cookie= "Key=value";

This problem does not occur, even if the current domain is still ab.cn.

This article http://support.microsoft.com/kb/310676/en-us/mentioned a similar problem, but it seems quite different from this. We can also refer to it.

Because the cookie set failed, our traffic monitoring system thought that each access was a new access, the natural bounce rate is very high, and GA looks like the cookie set failed to send data.

Firefox and Chrome don't have the same problem.

Mark, I want to help people who are having similar problems.