How to delete a cookie?

问题:

Is my function of creating a cookie correct? How do I delete the cookie at the beginning of my program? is there a simple coding?

function createCookie(name,value,days) 

function setCookie(c_name,value,1) {   document.cookie = c_name + "=" +escape(value); }  setCookie('cookie_name',mac);  function eraseCookie(c_name) {   createCookie(cookie_name,"",-1); } 

回答1:

Try this:

function delete_cookie( name, path, domain ) {   if( get_cookie( name ) ) {     document.cookie = name + "=" +       ((path) ? ";path="+path:"")+       ((domain)?";domain="+domain:"") +       ";expires=Thu, 01 Jan 1970 00:00:01 GMT";   } } 

Or:

function delete_cookie( name ) {   document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;'; } 

回答2:

Here a good link on Quirksmode.

function setCookie(name,value,days) {     var expires = "";     if (days) {         var date = new Date();         date.setTime(date.getTime() + (days*24*60*60*1000));         expires = "; expires=" + date.toUTCString();     }     document.cookie = name + "=" + (value || "")  + expires + "; path=/"; } function getCookie(name) {     var nameEQ = name + "=";     var ca = document.cookie.split(';');     for(var i=0;i 

回答3:

would this work?

function eraseCookie(name) {     document.cookie = name + '=; Max-Age=0' } 

I know Max-Age causes the cookie to be a session cookie in IE when creating the cookie. Not sure how it works when deleting cookies.

回答4:

You can do this by setting the date of expiry to yesterday.

Setting it to "-1" doesn't work. That marks a cookie as a Sessioncookie.

回答5:

Here is an implementation of a delete cookie function with unicode support from Mozilla:

function removeItem(sKey, sPath, sDomain) {     document.cookie = encodeURIComponent(sKey) +                    "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" +                    (sDomain ? "; domain=" + sDomain : "") +                    (sPath ? "; path=" + sPath : ""); }  removeItem("cookieName"); 

If you use AngularJs, try $cookies.remove (underneath it uses a similar approach):

$cookies.remove('cookieName'); 

回答6:

To delete a cookie I set it again with an empty value and expiring in 1 second. In details, I always use one of the following flavours (I tend to prefer the second one):

1.

    function setCookie(key, value, expireDays, expireHours, expireMinutes, expireSeconds) {         var expireDate = new Date();         if (expireDays) {             expireDate.setDate(expireDate.getDate() + expireDays);         }         if (expireHours) {             expireDate.setHours(expireDate.getHours() + expireHours);         }         if (expireMinutes) {             expireDate.setMinutes(expireDate.getMinutes() + expireMinutes);         }         if (expireSeconds) {             expireDate.setSeconds(expireDate.getSeconds() + expireSeconds);         }         document.cookie = key +"="+ escape(value) +             ";domain="+ window.location.hostname +             ";path=/"+             ";expires="+expireDate.toUTCString();     }      function deleteCookie(name) {         setCookie(name, "", null , null , null, 1);     } 

Usage:

setCookie("reminder", "buyCoffee", null, null, 20); deleteCookie("reminder"); 

2

    function setCookie(params) {         var name            = params.name,             value           = params.value,             expireDays      = params.days,             expireHours     = params.hours,             expireMinutes   = params.minutes,             expireSeconds   = params.seconds;          var expireDate = new Date();         if (expireDays) {             expireDate.setDate(expireDate.getDate() + expireDays);         }         if (expireHours) {             expireDate.setHours(expireDate.getHours() + expireHours);         }         if (expireMinutes) {             expireDate.setMinutes(expireDate.getMinutes() + expireMinutes);         }         if (expireSeconds) {             expireDate.setSeconds(expireDate.getSeconds() + expireSeconds);         }          document.cookie = name +"="+ escape(value) +             ";domain="+ window.location.hostname +             ";path=/"+             ";expires="+expireDate.toUTCString();     }      function deleteCookie(name) {         setCookie({name: name, value: "", seconds: 1});     } 

Usage:

setCookie({name: "reminder", value: "buyCoffee", minutes: 20}); deleteCookie("reminder"); 

回答7:

I had trouble deleting a cookie made via JavaScript and after I added the host it worked. After clearing the cookies on a domain try the following to see the results:

if (document.cookie.length==0) {  document.cookie = 'name=example; expires='+new Date((new Date()).valueOf()+1000*60*60*24*15)+'; path=/; domain='+location.host;   if (document.cookie.length==0) {alert('Cookies disabled');}  else  {   document.cookie = 'name=example; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/; domain='+location.host;    if (document.cookie.length==0) {alert('Created AND deleted cookie successfully.');}   else {alert('document.cookies.length = '+document.cookies.length);}  } } 

文章来源: How to delete a cookie?