我已经使用这个线程的公认答案很多次了。这是一段很棒的代码:简单且可用。但我通常使用babel和ES6和模块，所以如果你像我一样，这里有一些代码可以复制，以更快地使用ES6开发

接受答案改写为模块与ES6:

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.toUTCString();
  } 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 '';
};

在这之后，你可以简单地导入它作为任何模块(路径当然可能不同):

import {createCookie, getCookie} from './../helpers/Cookie';

以下是可以用于创建和检索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 = "; 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 "";
}

JQuery cookie

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);
      }
   }
}

我用这个物体。值是经过编码的，所以在从服务器端读写时必须考虑到这一点。

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
};

})();

我已经使用这个线程的公认答案很多次了。这是一段很棒的代码:简单且可用。但我通常使用babel和ES6和模块，所以如果你像我一样，这里有一些代码可以复制，以更快地使用ES6开发

接受答案改写为模块与ES6:

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.toUTCString();
  } 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 '';
};

在这之后，你可以简单地导入它作为任何模块(路径当然可能不同):

import {createCookie, getCookie} from './../helpers/Cookie';

使用模板文字的非常短的ES6函数。请注意，您需要自己编码/解码这些值，但对于存储版本号等更简单的目的，它可以开箱即用。

const getCookie = (cookieName) => {
  return (document.cookie.match(`(^|;) *${cookieName}=([^;]*)`)||[])[2]
}
  
const setCookie = (cookieName, value, days=360, path='/') => {
  let expires = (new Date(Date.now()+ days*86400*1000)).toUTCString();
  document.cookie = `${cookieName}=${value};expires=${expires};path=${path};`
}

const deleteCookie = (cookieName) => {
  document.cookie = `${cookieName}=;expires=Thu, 01 Jan 1970 00:00:01 GMT;path=/;`;
}