按名称查找cookie，然后使用javascript(无jquery）返回包含值的cookie

find a cookie by name then return the cookie including the value using javascript (no jquery)

本文关键字：cookie jquery javascript 包含值 返回 查找 然后      更新时间：2023-09-26

是否有从document.cookie获取cookie的懒惰方法？

如果document.cookie是例如

abc_tracker=abc_visit_time%3D14352506807463%7 abc_campaign_id%3D0%7 abc_adgroup_id%3D10%7 abc_content_id%3B0%7 abc_mediate%3referration%7 abc_source%3Dblog.example.com%7 abc_activity%3none%7 abc_ad group%3none%7%abc_content%3none%7abc_term%3none%7 abc_match%3none+7abc_keyword%3Dbm9uZQ%3D%3D%7 abc_url%3DaHR0cDovL3d3dy5nb3 dheS5jb20vP19nYT0xLjM4NTgyNjkxLjEyMTg5NTk2Mi4xNDM1MjQ5OTU2%7Cabc_ref_url%3DaHR0cDovL2Jsb2cuZ293YXkuY29tL2dsb2JldHJvdHRpbmcvP19nYT0xLjM4NTgyNjkxLjEyMTg5NTk2Mi4xNDM1MjQ5OTU2；viewedOuibounceModal=true；LAstrongLIDEIN_VIEW=1435262685800；LAstrongLIDEIN_TYPE=聊天；c_m=vst_channel%3未定义%7 vst_keyword%3未定义%7%vst_referringDomain%3未定义%7vst_campaign%3未定义；__atuvc=11%7C25__atuvs=558d4a4029c67edc001；bloglanding=false；vst_tracker=id%3D143532282823%7Vid%3D1435256077463%7Medium%3Direct%7%entry_page_url%3Dhttp%253A%252F%252Fww.example.com%252F；__utma=148710120.217599539.14335256807.1435262252.14322883.3__utmb=148710120.18.1435322883__utmc=148710120__utmz=148710120.1435256807.1.1。utmcsr=blog.example.com|utmccn=（referral）|utmcmd=referral |utmct=/globetrotting/；__utmv=148710120.|1=vtime=1435256807463=1；abc_page_count=7；s_cc=真；s_fid=0B06C0537063F838-34C8F3D8F41ABCC8；s_sq=%5B%5B%5D%5D_ga=GA1.2.121895962.1435249956；__ar_v4=6UZ4UQZOCVE2RJGEKNO2AE%3A20150625%3A2%7LDQ27DO6EHARNHUHLKF3%3A20150225%3A41%7RYLYAX2L7NBGHDJQDTJYYL%3A20150725%3A41%7DYK2HT5L5FGJJFFVXXPM4K%3A20150025%3A38%7VIWWR64QNBEITBBPWIV5TWP%3A20150625%3A1

假设我想找到_ga饼干。阅读上面（底部附近）的cookie，整个事情就是_ga=GA1.2.121895962.1435249956

仅使用vanilla Javascript，最简单的检索方法是什么？

我陷入了一个试图使用火柴的兔子洞：

var bla = document.cookie.match(/_ga/) // returns the matched string.
bla.input // returns the whole thing.

基于输入"_ga"，有什么简单的方法可以返回以下值：_ga=GA1.2.121895962.1435249956

首先，设置函数

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);
}

然后你只需要阅读并设置它。

//Setting
createCookie('_ga','9saua9s8d89w',7);
//Reading
var x = readCookie('_ga')
if (x) {
    //[do something with x]
}

编辑通过REGEXP

function readCookie(cookieName) {
 var re = new RegExp('[; ]'+cookieName+'=([^''s;]*)');
 var sMatch = (' '+document.cookie).match(re);
 if (cookieName && sMatch) return unescape(sMatch[1]);
 return '';
}

然后

var x = readCookie('_ga');
if (x) {
    //[do something with x]
}

OR，仅REGEXP代码

var cookie = "_ga"
var re = new RegExp('[; ]'+cookie+'=([^''s;]*)');
var cookieVal = unescape((' '+document.cookie).match(re)[1]);
console.log(cookieVal); //GA1.2.116321536.1432242890

尝试以下操作：

var _ga = document.cookie.split(';').map(function(x) {
  return x.trim().split(/(=)/);
}).reduce(function(a, b) {
  a[b[0]] = a[b[0]] ? a[b[0]] + ', ' + b.slice(2).join('') :
    b.slice(2).join('');
  return a;
}, {})["_ga"]; // <--- cookie you are looking for.
console.log(_ga);

在这里你可以找到更多的信息。

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