Javascript 如何更新和删除cookie？
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How to update and delete a cookie?
提问by San Jay
I need help to know how to update values and how to delete a cookiecreated from this code! I'm new to JavaScript so it's great if anyone can help me.
我需要帮助才能知道如何更新值以及如何删除从此代码创建的cookie！我是 JavaScript 的新手，所以如果有人可以帮助我，那就太好了。
function getCookie(c_name) {
var i,x,y,ARRcookies = document.cookie.split(";");
for (i=0;i<ARRcookies.length;i++) {
x = ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
y = ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
x = x.replace(/^\s+|\s+$/g,"");
if (x==c_name) {
return unescape(y);
}
}
}
function setCookie(c_name,value,exdays) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value = escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
document.cookie=c_name + "=" + c_value;
}
function check2Cookie() {
var username=getCookie("username");
if (username!=null && username!="") {
username= "0";
setCookie("username",username,1000);
}
else {
username=" ";
if (username!=null && username!="") {
username= "0";
setCookie("username",username,1000);
}
}
}
This is the code for cookie creation.
这是创建 cookie 的代码。
Code for creating is setCookie("username",username,1000);
创建代码是 setCookie("username",username,1000);
Now how to update this cookie and delete this cookie.
现在如何更新这个 cookie 和删除这个 cookie。
回答by jordanb
The cookie API is kind of lame. Let me clarify...
cookie API 有点蹩脚。让我澄清...
You don't update cookies; you overwritethem:
您不更新 cookie；你覆盖它们：
document.cookie = "username=Arnold"; // Create 'username' cookie
document.cookie = "username=Chuck"; // Update, i.e. overwrite, the 'username' cookie to "Chuck"
You also don't delete cookies; you expirethem by setting the expireskey to a time in the past (-1 works too).
您也不会删除 cookie；您过期通过设置这些expires关键的时间过去（-1工作太）。
Source: https://developer.mozilla.org/en-US/docs/Web/API/document.cookie
来源：https: //developer.mozilla.org/en-US/docs/Web/API/document.cookie
回答by Dave Lasley
http://www.quirksmode.org/js/cookies.html
http://www.quirksmode.org/js/cookies.html
update would just be resetting it using createCookie
更新只会使用 createCookie 重置它
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 *1000));
var expires = "; expires=" + date.toGMTString();
} else {
var expires = "";
}
document.cookie = name + "=" + value + expires + "; path=/";
}
function readCookie(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) {
createCookie(name,"",-1);
}
回答by epascarello
http://www.quirksmode.org/js/cookies.html
http://www.quirksmode.org/js/cookies.html
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(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) {
createCookie(name,"",-1);
}
回答by xiaoyu2er
check this out A little framework: a complete cookies reader/writer with full Unicode support
看看这个一个小框架：一个完整的 cookie 读取器/写入器，具有完整的 Unicode 支持
/*\
|*|
|*| :: cookies.js ::
|*|
|*| A complete cookies reader/writer framework with full unicode support.
|*|
|*| Revision #1 - September 4, 2014
|*|
|*| https://developer.mozilla.org/en-US/docs/Web/API/document.cookie
|*| https://developer.mozilla.org/User:fusionchess
|*| https://github.com/madmurphy/cookies.js
|*|
|*| This framework is released under the GNU Public License, version 3 or later.
|*| http://www.gnu.org/licenses/gpl-3.0-standalone.html
|*|
|*| Syntaxes:
|*|
|*| * docCookies.setItem(name, value[, end[, path[, domain[, secure]]]])
|*| * docCookies.getItem(name)
|*| * docCookies.removeItem(name[, path[, domain]])
|*| * docCookies.hasItem(name)
|*| * docCookies.keys()
|*|
\*/
var docCookies = {
getItem: function (sKey) {
if (!sKey) { return null; }
return decodeURIComponent(document.cookie.replace(new RegExp("(?:(?:^|.*;)\s*" + encodeURIComponent(sKey).replace(/[\-\.\+\*]/g, "\$&") + "\s*\=\s*([^;]*).*$)|^.*$"), "")) || null;
},
setItem: function (sKey, sValue, vEnd, sPath, sDomain, bSecure) {
if (!sKey || /^(?:expires|max\-age|path|domain|secure)$/i.test(sKey)) { return false; }
var sExpires = "";
if (vEnd) {
switch (vEnd.constructor) {
case Number:
sExpires = vEnd === Infinity ? "; expires=Fri, 31 Dec 9999 23:59:59 GMT" : "; max-age=" + vEnd;
break;
case String:
sExpires = "; expires=" + vEnd;
break;
case Date:
sExpires = "; expires=" + vEnd.toUTCString();
break;
}
}
document.cookie = encodeURIComponent(sKey) + "=" + encodeURIComponent(sValue) + sExpires + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "") + (bSecure ? "; secure" : "");
return true;
},
removeItem: function (sKey, sPath, sDomain) {
if (!this.hasItem(sKey)) { return false; }
document.cookie = encodeURIComponent(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "");
return true;
},
hasItem: function (sKey) {
if (!sKey) { return false; }
return (new RegExp("(?:^|;\s*)" + encodeURIComponent(sKey).replace(/[\-\.\+\*]/g, "\$&") + "\s*\=")).test(document.cookie);
},
keys: function () {
var aKeys = document.cookie.replace(/((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:|$)/g, "").split(/\s*(?:\=[^;]*)?;\s*/);
for (var nLen = aKeys.length, nIdx = 0; nIdx < nLen; nIdx++) { aKeys[nIdx] = decodeURIComponent(aKeys[nIdx]); }
return aKeys;
}
};
