Javascript 如何从cookie中创建和读取值?
如何在JavaScript中创建和读取cookie中的值?以下是可用于创建和检索cookie的函数Javascript 如何从cookie中创建和读取值?,javascript,cookies,Javascript,Cookies,如何在JavaScript中创建和读取cookie中的值?以下是可用于创建和检索cookie的函数 function createCookie(name, value, days) { var expires; if (days) { var date = new Date(); date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000)); expires = "; exp
function createCookie(name, value, days) {
var expires;
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
}
else {
expires = "";
}
document.cookie = name + "=" + value + expires + "; path=/";
}
function getCookie(c_name) {
if (document.cookie.length > 0) {
c_start = document.cookie.indexOf(c_name + "=");
if (c_start != -1) {
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexOf(";", c_start);
if (c_end == -1) {
c_end = document.cookie.length;
}
return unescape(document.cookie.substring(c_start, c_end));
}
}
return "";
}
或纯Javascript:
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 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);
}
}
}
函数setCookie(c_名称、值、exdays)
{
var exdate=新日期();
exdate.setDate(exdate.getDate()+exdays);
var c_value=escape(value)+(exdays==null)?:(“expires=“+exdate.toutString());
document.cookie=c_name+“=”+c_值;
}
函数getCookie(c_名称)
{
变量i,x,y,ARRcookies=document.cookie.split(“;”);
对于(i=0;iMozilla创建了一个示例,以及如何使用它的示例
一旦包含在页面上,您可以设置cookie:
docCookies.setItem(name, value);
docCookies.getItem(name);
docCookies.removeItem(name);
阅读cookie:
docCookies.setItem(name, value);
docCookies.getItem(name);
docCookies.removeItem(name);
或删除cookie:
docCookies.setItem(name, value);
docCookies.getItem(name);
docCookies.removeItem(name);
例如:
// sets a cookie called 'myCookie' with value 'Chocolate Chip'
docCookies.setItem('myCookie', 'Chocolate Chip');
// reads the value of a cookie called 'myCookie' and assigns to variable
var myCookie = docCookies.getItem('myCookie');
// removes the cookie called 'myCookie'
docCookies.removeItem('myCookie');
请参阅有关的更多示例和详细信息
此简单js文件的一个版本是。readCookie的改进版本:
function readCookie( name )
{
var cookieParts = document.cookie.split( ';' )
, i = 0
, part
, part_data
, value
;
while( part = cookieParts[ i++ ] )
{
part_data = part.split( '=' );
if ( part_data.shift().replace(/\s/, '' ) === name )
{
value = part_data.shift();
break;
}
}
return value;
}
当你找到你的cookie值并返回它的值时,它应该立即中断。在我看来,双分割非常优雅
if条件下的替换为空白微调,以确保其正确匹配函数setCookie(cname、cvalue、exdays){
function setCookie(cname,cvalue,exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires=" + d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
}
function getCookie(cname) {
var name = cname + "=";
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);
if (c.indexOf(name) == 0) {
return c.substring(name.length, c.length);
}
}
return "";
}
function checkCookie() {
var user=getCookie("username");
if (user != "") {
alert("Welcome again " + user);
} else {
user = prompt("Please enter your name:","");
if (user != "" && user != null) {
setCookie("username", user, 30);
}
}
}
var d=新日期();
d、 设置时间(d.getTime()+(exdays*24*60*60*1000));
var expires=“expires=“+d.togmString();
document.cookie=cname+“=”+cvalue+”;“+expires;
}
函数getCookie(cname){
变量名称=cname+“=”;
var ca=document.cookie.split(“;”);
对于(var i=0;i < p>),我使用这个对象。值被编码,因此在服务器端读写时必须考虑它。
cookie = (function() {
/**
* Sets a cookie value. seconds parameter is optional
*/
var set = function(name, value, seconds) {
var expires = seconds ? '; expires=' + new Date(new Date().getTime() + seconds * 1000).toGMTString() : '';
document.cookie = name + '=' + encodeURIComponent(value) + expires + '; path=/';
};
var map = function() {
var map = {};
var kvs = document.cookie.split('; ');
for (var i = 0; i < kvs.length; i++) {
var kv = kvs[i].split('=');
map[kv[0]] = decodeURIComponent(kv[1]);
}
return map;
};
var get = function(name) {
return map()[name];
};
var remove = function(name) {
set(name, '', -1);
};
return {
set: set,
get: get,
remove: remove,
map: map
};
})();
cookie=(函数(){
/**
*设置cookie值。秒参数是可选的
*/
变量集=函数(名称、值、秒){
var expires=seconds?';expires='+新日期(new Date().getTime()+seconds*1000);
document.cookie=name+'='+encodeURIComponent(value)+expires+';path=/';
};
var map=function(){
var-map={};
var kvs=document.cookie.split(“;”);
对于(变量i=0;i
我已经多次使用此线程的公认答案。这是一段很棒的代码:简单且可用。但我通常使用和ES6以及模块,因此,如果您像我一样,这里有一些代码可以复制,以便使用ES6更快地开发
用ES6重写为模块:
export const createCookie = ({name, value, days}) => {
let expires;
if (days) {
let date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = '; expires=' + date.toGMTString();
} else {
expires = '';
}
document.cookie = name + '=' + value + expires + '; path=/';
};
export const getCookie = ({name}) => {
if (document.cookie.length > 0) {
let c_start = document.cookie.indexOf(name + '=');
if (c_start !== -1) {
c_start = c_start + name.length + 1;
let c_end = document.cookie.indexOf(';', c_start);
if (c_end === -1) {
c_end = document.cookie.length;
}
return unescape(document.cookie.substring(c_start, c_end));
}
}
return '';
};
在此之后,您只需将其作为任何模块导入即可(路径当然可能会有所不同):
这里有一个代码
函数getCookie(名称){
名称=名称+“=”;
var cookies=document.cookie.split(“;”);
对于(var i=0;i最低限度和全功能ES6方法:
const setCookie = (name, value, days = 7, path = '/') => {
const expires = new Date(Date.now() + days * 864e5).toUTCString()
document.cookie = name + '=' + encodeURIComponent(value) + '; expires=' + expires + '; path=' + path
}
const getCookie = (name) => {
return document.cookie.split('; ').reduce((r, v) => {
const parts = v.split('=')
return parts[0] === name ? decodeURIComponent(parts[1]) : r
}, '')
}
const deleteCookie = (name, path) => {
setCookie(name, '', -1, path)
}
对于那些需要保存对象如{foo:'bar'}的人,我将分享我编辑过的@KevinBurke的答案。我添加了JSON.stringify和JSON.parse,仅此而已
cookie = {
set: function (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 + "=" + JSON.stringify(value) + expires + "; path=/";
},
get : function(name){
var nameEQ = name + "=",
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 JSON.parse(c.substring(nameEQ.length,c.length));
}
return null;
}
}
ES6中读取cookie的简单方法
function getCookies() {
var cookies = {};
for (let cookie of document.cookie.split('; ')) {
let [name, value] = cookie.split("=");
cookies[name] = decodeURIComponent(value);
}
console.dir(cookies);
}
我已经习惯了成功
<script src="/path/to/js.cookie.js"></script>
<script>
Cookies.set('foo', 'bar');
Cookies.get('foo');
</script>
Cookies.set('foo','bar');
Cookies.get('foo');
ES7,为get()使用正则表达式。基于
用法-Cookie.get(名称、值[、选项]):
选项支持所有标准cookie选项并添加“天”:
- 路径:“/”-任何绝对路径。默认值:当前文档位置
- 域:“sub.example.com”-不能以点开头。默认值:当前主机没有子域
- 安全:true-仅通过https提供cookie。默认值:false
- 天:cookie过期前2天。默认值:会话结束。
设置过期时间的其他方法:
- 到期日期:“Sun,2018年2月18日16:23:42 GMT”-到期日期作为GMT字符串。
当前日期可以通过以下方式获取:new date(date.now()).toutString()
- “最大年龄”:30-与天相同,但以秒为单位,而不是以天为单位
其他答案使用“expires”而不是“max age”来支持旧版IE。这种方法需要ES7,所以IE7无论如何都不支持(这没什么大不了的)
注意:支持将“=”和“{:}”等有趣字符作为cookie值,并且正则表达式处理前导和尾随空格(来自其他LIB)。
如果要存储对象,请使用和JSON.stringify和JSON.parse在对象之前和之后对其进行编码,编辑上述内容,或添加其他方法。例如:
Cookie.getJSON = name => JSON.parse(Cookie.get(name))
Cookie.setJSON = (name, value, opts) => Cookie.set(name, JSON.stringify(value), opts);
我编写了简单的cookieUtils,它有三个函数用于创建cookie、读取cookie和删除cookie
var CookieUtils = {
createCookie: function (name, value, expireTime) {
expireTime = !!expireTime ? expireTime : (15 * 60 * 1000); // Default 15 min
var date = new Date();
date.setTime(date.getTime() + expireTime);
var expires = "; expires=" + date.toGMTString();
document.cookie = name + "=" + value + expires + "; path=/";
},
getCookie: function (name) {
var value = "; " + document.cookie;
var parts = value.split("; " + name + "=");
if (parts.length == 2) {
return parts.pop().split(";").shift();
}
},
deleteCookie: function(name) {
document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}
};
一种厚颜无耻且简单的解读饼干的方式可能是:
let username, id;
eval(document.cookie);
console.log(username + ", " + id); // John Doe, 123
如果您知道您的cookie包含类似以下内容,则可以使用此选项:username=“John Doe”id=123;
。请注意,cookie中的字符串可能需要引号。这可能不是推荐的方法,但可用于测试/学习。以下是所提到的示例
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+ d.toUTCString();
document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
function getCookie(cname) {
var name = cname + "=";
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
for(var i = 0; i <ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') {
c = c.substring(1);
}
if (c.indexOf(name) == 0) {
return c.substring(name.length, c.length);
}
}
return "";
}
函数setCookie(cname、cvalue、exdays){
var d=新日期();
d、 设置时间(d.getTime()+(exdays*24*60*60*1000));
var expires=“expires=“+d.toutString();
document.cookie=cname+“=”+cvalue+”;“+expires+”;path=/”;
}
函数getCookie(cname){
变量名称=cname+“=”;
var decodedCookie=decodeURIComponent(document.cookie);
var ca=decodedCookie.split(“;”);
对于(var i=0;i您可以使用我的for get/set/remove cookie
name: cookie name.
用法:
在头标签中,包括以下代码:
<script src="https://raw.githack.com/anhr/cookieNodeJS/master/build/cookie.js"></script>
范例
if ( cookie.isEnabled() )
console.log('cookie is enabled on your browser');
else
console.error('cookie is disabled on your browser');
cookie.set('age', 25);
cookie.set(名称、值)
放一块饼干
name: cookie name.
value: cookie value.
name: cookie name.
defaultValue: cookie default value. Default is undefined.
returns cookie value or defaultValue if cookie was not found
范例
if ( cookie.isEnabled() )
console.log('cookie is enabled on your browser');
else
console.error('cookie is disabled on your browser');
cookie.set('age', 25);
get(name[,defaultValue]);
买块饼干
name: cookie name.
value: cookie value.
name: cookie name.
defaultValue: cookie default value. Default is undefined.
returns cookie value or defaultValue if cookie was not found
例子
cookie.remove(名称);
移除cookie
name: cookie name.
例子
简单的阅读
var getCookie = function (name) {
var valueStart = document.cookie.indexOf(name + "=") + name.length + 1;
var valueEnd = document.cookie.indexOf(";", valueStart);
return document.cookie.slice(valueStart, valueEnd)
}
我使用了以下函数,这些函数是我从各种来源中找到的最好的函数,并剔除了一些bug或差异