how todelete all cookies created in javascipt

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Javascript

MVC

i have craeted cookies using javascript on each page and want to delete all cookies on sign out..i have tried it following in admin layout but it does not work so how to do plz help..

//

var cookies = $.cookie();
           alert(cookies);//null
           for (var cookie in cookies)
           {
               $.removeCookie(cookie);
           }