Javascript 如何删除cookie？
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How to delete a cookie?
提问by kennedy
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?
我创建cookie的功能是否正确？如何删除程序开始时的 cookie？有简单的编码吗？
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by ACP
Try this:
尝试这个：
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:
或者：
function delete_cookie( name ) {
document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}
回答by Luca Matteis
Here a good link on Quirksmode.
这里有一个关于Quirksmode的好链接。
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 < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
function eraseCookie(name) {
document.cookie = name+'=; Max-Age=-99999999;';
}
回答by Collin Anderson
would this work?
这行得通吗？
function eraseCookie(name) {
document.cookie = name + '=; Max-Age=0'
}
I know Max-Agecauses the cookie to be a session cookie in IE when creating the cookie. Not sure how it works when deleting cookies.
我知道Max-Age在创建 cookie 时会导致 cookie 成为 IE 中的会话 cookie。不确定删除 cookie 时它是如何工作的。
回答by Vitalii Fedorenko
Here is an implementation of a delete cookiefunction with unicode support from Mozilla:
这是Mozilla 支持 unicode的删除 cookie函数的实现：
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 $cookies.remove(underneath it uses a similar approach):
如果您使用 AngularJs，请尝试$cookies.remove（在它下面使用类似的方法）：
$cookies.remove('cookieName');
回答by Markus Nordhaus
You can do this by setting the date of expiry to yesterday.
您可以通过将到期日期设置为昨天来做到这一点。
Setting it to "-1" doesn't work. That marks a cookie as a Sessioncookie.
将其设置为“-1”不起作用。这将 cookie 标记为 Sessioncookie。
回答by Luca Borrione
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):
要删除 cookie，我再次将其设置为空值并在 1 秒后过期。具体来说，我总是使用以下其中一种口味（我更喜欢第二种）：
1.
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:
用法：
setCookie("reminder", "buyCoffee", null, null, 20);
deleteCookie("reminder");
2
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:
用法：
setCookie({name: "reminder", value: "buyCoffee", minutes: 20});
deleteCookie("reminder");
回答by Lemmings19
Some of the other solutions might not work if you created the cookie manually.
如果您手动创建 cookie，其他一些解决方案可能不起作用。
Here's a quick way to delete a cookie:
以下是删除 cookie 的快速方法：
document.cookie = 'COOKIE_NAME=; Max-Age=0; path=/; domain=' + location.host;
回答by John
I had trouble deleting a cookie made via JavaScript and after I added the host it worked (scroll the code below to the right to see the location.host). After clearing the cookies on a domain try the following to see the results:
我在删除通过 JavaScript 制作的 cookie 时遇到了麻烦，在我添加了主机后它可以工作（将下面的代码滚动到右侧以查看location.host）。清除域上的 cookie 后，请尝试以下操作以查看结果：
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);}
}
}
