Javascript 按名称获取cookie
我有一个从cookie中获取值的getter 现在我有两个cookie,分别是名为Javascript 按名称获取cookie,javascript,cookies,Javascript,Cookies,我有一个从cookie中获取值的getter 现在我有两个cookie,分别是名为共享=和名为义务= 我只想让这个getter从义务cookie中获取值 我该怎么做?因此的将数据拆分为单独的值,并将其放入数组中 function getCookie1() { // What do I have to add here to look only in the "obligations=" cookie? // Because now it searches all the co
共享=
和名为义务=
我只想让这个getter从义务cookie中获取值
我该怎么做?因此的将数据拆分为单独的值,并将其放入数组中
function getCookie1() {
// What do I have to add here to look only in the "obligations=" cookie?
// Because now it searches all the cookies.
var elements = document.cookie.split('=');
var obligations= elements[1].split('%');
for (var i = 0; i < obligations.length - 1; i++) {
var tmp = obligations[i].split('$');
addProduct1(tmp[0], tmp[1], tmp[2], tmp[3]);
}
}
函数getCookie1(){
//我必须在这里添加什么才能只查看“cookie”?
//因为现在它搜索所有的cookies。
var元素=document.cookie.split('=');
var义务=元素[1]。拆分(“%”);
对于(变量i=0;i<0.length-1;i++){
var tmp=债务[i]。拆分(“$”);
addProduct1(tmp[0],tmp[1],tmp[2],tmp[3]);
}
}
使用cookie获取脚本:
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;
}
我从quirksmode cookies页面偷了上面的代码 在我看来,您可以将cookie键值对拆分为一个数组,并基于该数组进行搜索:
var obligations = getCookieData("obligations");
它运行以下命令:
function getCookieData( name ) {
var pairs = document.cookie.split("; "),
count = pairs.length, parts;
while ( count-- ) {
parts = pairs[count].split("=");
if ( parts[0] === name )
return parts[1];
}
return false;
}
function getCookieData( name ) {
var patrn = new RegExp( "^" + name + "=(.*?);" ),
patr2 = new RegExp( " " + name + "=(.*?);" );
if ( match = (document.cookie.match(patrn) || document.cookie.match(patr2)) )
return match[1];
return false;
}
小提琴:
甚至可能是以下情况:
function getCookieData( name ) {
var pairs = document.cookie.split("; "),
count = pairs.length, parts;
while ( count-- ) {
parts = pairs[count].split("=");
if ( parts[0] === name )
return parts[1];
}
return false;
}
function getCookieData( name ) {
var patrn = new RegExp( "^" + name + "=(.*?);" ),
patr2 = new RegExp( " " + name + "=(.*?);" );
if ( match = (document.cookie.match(patrn) || document.cookie.match(patr2)) )
return match[1];
return false;
}
一种避免在数组上迭代的方法是:
function getCookie(name) {
const value = `; ${document.cookie}`;
const parts = value.split(`; ${name}=`);
if (parts.length === 2) return parts.pop().split(';').shift();
}
演练
如果字符串中不存在令牌,则按令牌拆分字符串将生成一个具有一个字符串(相同值)的数组,如果在字符串中找到令牌,则生成一个具有两个字符串的数组
第一个(左)元素是令牌之前的字符串,第二个(右)元素是令牌之后的字符串
(注意:如果字符串以标记开头,则第一个元素为空字符串)
考虑到Cookie的存储方式如下:
"{name}={value}; {name}={value}; ..."
为了检索特定的cookie值,我们只需要获取“{name}=”之后和“下一步”之前的字符串。在进行任何处理之前,我们会在cookies字符串的前面加上“;”,这样每个cookie名称,包括第一个cookie名称,都会加上“;”和“=”:
现在,我们可以首先按“{name}=”拆分,如果在cookie字符串中找到标记(即,我们有两个元素),那么第二个元素将是以cookie值开头的字符串。然后我们从一个数组中取出它(即pop),重复相同的过程,但现在使用“;”作为标记,但这次取出左字符串(即shift)以获得实际的标记值。在我的项目中,我使用以下函数按名称访问cookie
function getCookie(cookie) {
return document.cookie.split(';').reduce(function(prev, c) {
var arr = c.split('=');
return (arr[0].trim() === cookie) ? arr[1] : prev;
}, undefined);
}
我更喜欢在cookie上使用单个正则表达式匹配:
window.getCookie = function(name) {
var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
if (match) return match[2];
}
或者我们也可以将其用作函数,请检查下面的代码
function check_cookie_name(name)
{
var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
if (match) {
console.log(match[2]);
}
else{
console.log('--something went wrong---');
}
}
感谢Scott Jungwirth在评论中的改进。我修改了Jonathan在此提供的函数,通过使用正则表达式,您可以通过其名称获得cookie值,如下所示:
function getCookie(name){
var pattern = RegExp(name + "=.[^;]*")
var matched = document.cookie.match(pattern)
if(matched){
var cookie = matched[0].split('=')
return cookie[1]
}
return false
}
var value = $.cookie("obligations");
如果返回空字符串,则表示cookie存在但没有值,如果返回false,则cookie不存在。我希望这有帮助。如果您使用jQuery,我建议您使用此插件:
您还可以编写cookie:
$.cookie('obligations', 'new_value');
$.cookie('obligations', 'new_value', { expires: 14, path: '/' });
$.removeCookie('obligations');
删除cookie:
$.cookie('obligations', 'new_value');
$.cookie('obligations', 'new_value', { expires: 14, path: '/' });
$.removeCookie('obligations');
其他一些答案中使用正则表达式的方法并不涵盖所有情况,特别是:
function getCookie(name) {
function escape(s) { return s.replace(/([.*+?\^$(){}|\[\]\/\\])/g, '\\$1'); }
var match = document.cookie.match(RegExp('(?:^|;\\s*)' + escape(name) + '=([^;]*)'));
return match ? match[1] : null;
}
如果找不到cookie,则返回null
。如果cookie的值为空,它将返回一个空字符串
注:
name=value
对。每个分号后面似乎都有一个空格null
。找到匹配项时返回数组,索引[1]
处的元素是第一个匹配组的值(?:xxxx)
-形成一个不匹配的组^
-匹配字符串的开头|
-为组分离备选模式\\s*
-匹配一个分号,后跟零个或多个空格字符=
-匹配一个等号(xxxx)
-形成一个匹配组[^;]*
-匹配除分号以外的零个或多个字符。这意味着它将匹配最多(但不包括)分号或字符串结尾的字符我知道这是个老问题,但我也遇到了这个问题。为了记录在案,开发人员中有一些API Yoy可以只使用JS按名称获取任何cookie。代码也更干净(除了长线,我相信你可以很容易地修复) 如注释中所述,请注意,此方法假定键和值是使用encodeURIComponent()编码的。如果cookie的键和值未编码,请删除decode&encodeURIComponent() 始终运行良好:
function getCookie(cname) {
var name = cname + "=",
ca = document.cookie.split(';'),
i,
c,
ca_length = ca.length;
for (i = 0; i < ca_length; i += 1) {
c = ca[i];
while (c.charAt(0) === ' ') {
c = c.substring(1);
}
if (c.indexOf(name) !== -1) {
return c.substring(name.length, c.length);
}
}
return "";
}
function setCookie(variable, value, expires_seconds) {
var d = new Date();
d = new Date(d.getTime() + 1000 * expires_seconds);
document.cookie = variable + '=' + value + '; expires=' + d.toGMTString() + ';';
}
函数getCookie(cname){
变量名称=cname+“=”,
ca=document.cookie.split(“;”),
我
C
ca_长度=ca.长度;
对于(i=0;iObject.defineProperty(window, "Cookies", {
get: function() {
return document.cookie.split(';').reduce(function(cookies, cookie) {
cookies[cookie.split("=")[0]] = unescape(cookie.split("=")[1]);
return cookies
}, {});
}
});
alert( Cookies.obligations );
function getCookieValue(cookieName) {
var ca = document.cookie.split('; ');
return _.find(ca, function (cookie) {
return cookie.indexOf(cookieName) === 0;
});
}
function getCookie(name) {
var value = "; " + document.cookie;
var parts = value.split("; " + name + "=");
if (parts.length >= 2) return parts.pop().split(";").shift();
}
function getCookie(n) {
let a = `; ${document.cookie}`.match(`;\\s*${n}=([^;]+)`);
return a ? a[1] : '';
}
function getCookie(name) {
var pair = document.cookie.split('; ').find(x => x.startsWith(name+'='));
if (pair)
return pair.split('=')[1]
}
document.cookie = 'cookiename=tesing';
var value = $.cookie("cookiename");
alert(value);
function getcookie(cookiename){
var cookiestring = document.cookie;
var cookiearray = cookiestring.split(';');
for(var i =0 ; i < cookiearray.length ; ++i){
if(cookiearray[i].trim().match('^'+cookiename+'=')){
return cookiearray[i].replace(`${cookiename}=`,'').trim();
}
} return null;
}
getcookie('session_id');
// gets cookie with name session_id
function getCookie(needle) {
return document.cookie.split(';').map(function(cookiestring) {
cs = cookiestring.trim().split('=');
if(cs.length === 2) {
return {'name' : cs[0], 'value' : cs[1]};
} else {
return {'name' : '', 'value' : ''};
}
})
.filter(function(cookieObject) {
return (cookieObject.name === needle);
});
}
function getCookie(cn) {
var name = cn+"=";
var allCookie = decodeURIComponent(document.cookie).split(';');
var cval = [];
for(var i=0; i < allCookie.length; i++) {
if (allCookie[i].trim().indexOf(name) == 0) {
cval = allCookie[i].trim().split("=");
}
}
return (cval.length > 0) ? cval[1] : "";
}
var cookies=getCookieVal(mycookie);
alert(cookies.mykey);
function getCookieVal(parent) {
var cookievalue = $.cookie(parent).split('&');
var obj = {};
$.each(cookievalue, function (i, v) {
var key = v.substr(0, v.indexOf("="));
var val = v.substr(v.indexOf("=") + 1, v.length);
obj[key] = val;
});
return obj;
}
function getCookie(name) {
let cookie = {};
document.cookie.split(';').forEach(function(el) {
let [k,v] = el.split('=');
cookie[k.trim()] = v;
})
return cookie[name];
}
getCookie = function(name) {
var r = document.cookie.match("\\b" + name + "=([^;]*)\\b");
return r ? r[1] : null;
};
var obligations = getCookie('obligations');
<script src="https://cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.js"></script>
Cookies.set('name', 'value');
Cookies.get('name'); // => 'value'
document.cookie = "test1=Hello";
document.cookie = "test2=World";
var cookieValue = document.cookie.replace(/(?:(?:^|.*;\s*)test2\s*\=\s*([^;]*).*$)|^.*$/, "$1");
alert(cookieValue);
document.cookie.split('logged=true').length == 2
var cookie = ("; "+document.cookie).split("; YOUR_COOKIE_NAME=").pop().split(";").shift();
cookie = key=>((new RegExp((key || '=')+'=(.*?); ','gm')).exec(document.cookie+'; ') ||['',null])[1]
cookie('some-key')
function getcookie(name = '') {
let cookies = document.cookie;
let cookiestore = {};
cookies = cookies.split(";");
if (cookies[0] == "" && cookies[0][0] == undefined) {
return undefined;
}
cookies.forEach(function(cookie) {
cookie = cookie.split(/=(.+)/);
if (cookie[0].substr(0, 1) == ' ') {
cookie[0] = cookie[0].substr(1);
}
cookiestore[cookie[0]] = cookie[1];
});
return (name !== '' ? cookiestore[name] : cookiestore);
}
// Have some cookies :-)
document.cookie = "myCookies=delicious";
document.cookie = "myComputer=good";
document.cookie = "myBrowser=RAM hungry";
// Read them
console.log( "My cookies are " + getcookie('myCookie') );
// Outputs: My cookies are delicious
console.log( "My computer is " + getcookie('myComputer') );
// Outputs: My computer is good
console.log( "My browser is " + getcookie('myBrowser') );
// Outputs: My browser is RAM hungry
console.log( getcookie() );
// Outputs: {myCookie: "delicious", myComputer: "good", myBrowser: "RAM hungry"}
// (does cookie exist?)
if (getcookie('hidden_cookie')) {
console.log('Hidden cookie was found!');
} else {
console.log('Still no cookie :-(');
}
// (do any cookies exist?)
if (getcookie()) {
console.log("You've got cookies to eat!");
} else {
console.log('No cookies for today :-(');
}