How to remove a cookie by using Javascript?

How to remove the cookie set by

javascript:void(document.cookie=”PREF=ID=20b6e4c2f44943bb:U=4bf292d46faad806:TM=1249677602:LM=1257919388:S=odm0Ys-53ZueXfZG;path=/; domain=.开发者_如何学Cgoogle.com”);

The following statement doesn't work.

javascript:void(document.cookie=”PREF=ID=20b6e4c2f44943bb:U=4bf292d46faad806:TM=1249677602:LM=1257919388:S=odm0Ys-53ZueXfZG;expires=Thu, 01 Jan 1970 00:00:00 GMT;path=/; domain=.google.com”);

What's wrong with the removal code?

Trick is right... in particular you need to put any past-value in the expires header. (These days you'd use a full-year, though; the two-digit format goes back to the early Netscapes only.)

Also ensure you don't use smart quotes like in your quote above.

javascript:alert(document.cookie='PREF=X;path=/;domain=.google.com;expires=Sat, 01-Jan-2000 00:00:00 GMT');

Note that the format produced by Date.toGMTString is not the same as the date format required by the cookie specification, although it does still work in many browsers.

Your cookie domain is .google.com, if you're not actually running the code from that domain you will not be able to modify the cookie.

Why don't you just stick with one question or figure it out for yourself rather than keep posting your problems every few minutes?

e.g. https://stackoverflow.com/questions/1802210/how-to-recover-google-classic-design-from-its-new-design

How to reverse the effect of the following execution by using Javascript?

Thu, 01-Jan-70 00:00:01 GMT

Set time one second after midnight

Agreed, @bobince. The official documentation says to use Date.toUTCString() for cookie expiration dates.

I am 95% sure that you must set an expiration date when creating the cookie crumb if you want to force its removal later. A cookie crumb created without an explicit expiration date is a session cookie (crumb) by default, which means that it is not removed until the browser is closed. I recall trying to expire a session cookie to no avail, in the past.

If you do set an expiration date on the cookie crumb in the first place, remember that you can use a variable for the new expiration date.

// assuming a non-session cookie crumb called "someCrumbName" exists:
var now = new Date();
var expirationDate = new Date();
var someValue = "foo";

// set the expiration date to a week ago and delete the cookie
expirationDate.setDate(now.getDate() - 7);
document.cookie = "someCrumbName=" + someValue + ";expires=" + expirationDate.toUTCString();