总是很有效:

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() + ';';
}

对jQuery或任何东西都没有要求。纯粹的老JavaScript。

如果你使用jQuery，我建议你使用这个插件:

https://github.com/carhartl/jquery-cookie https://github.com/carhartl/jquery-cookie/blob/master/jquery.cookie.js

<script type="text/javascript"
 src="//cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js">

所以你可以这样读cookie:

var value = $.cookie("obligations");

你也可以写cookie:

$.cookie('obligations', 'new_value');
$.cookie('obligations', 'new_value', { expires: 14, path: '/' });

删除cookie:

$.removeCookie('obligations');

显然，MDN从未听说过单词边界正则表达式字符类\b，它与相邻的\w+相匹配，而\w+在两侧有界:

getCookie = function(name) {
    var r = document.cookie.match("\\b" + name + "=([^;]*)\\b");
    return r ? r[1] : null;
};

var obligations = getCookie('obligations');

使用object.defineProperty

有了这个，您可以轻松地访问cookie

Object.defineProperty(window, "Cookies", {
    get: function() {
        return document.cookie.split(';').reduce(function(cookies, cookie) {
            cookies[cookie.split("=")[0]] = unescape(cookie.split("=")[1]);
            return cookies
        }, {});
    }
});

从现在起，你可以这样做:

alert( Cookies.obligations );

这也会自动更新，所以如果你改变了一个cookie, cookie也会改变。

const cookies = 'key1=chocolate; key2=iceCream; key3=cookies;';

// convert string into array with split
const arrCookies = cookies.split('; '); // [ 'key1=chocolate', 'key2=iceCream', 'key3=cookies' ]

// split key value by equal sign
const arrArrCookiesKeyValue = arrCookies.map(cookie => [cookie.split('=')]);  // [[['key1', 'chocolate']], ...']

// make an object with key value
const objectKeyValueCookies = {}; // { key1: 'chocolate', key2: 'iceCream', key3: 'cookies;' }
for (let arr of arrArrCookiesKeyValue) {
    objectKeyValueCookies[arr[0][0]] = arr[0][1];
}

// find the key in object
const findValueByKey = (key = null, objectCookies) => objectCookies[key];
console.log(findValueByKey('key2', objectKeyValueCookies)); // chocolate

JS中的Set-Cookie

document.cookie = 'fb-event-id=15648779++';

通过名称函数获取cookie

function getCookie(name) {
    // Split cookie string and get all individual name=value pairs in an array
    var cookieArr = document.cookie.split(";");
    // Loop through the array elements
    for(var i = 0; i < cookieArr.length; i++) {
        var cookiePair = cookieArr[i].split("=");
        /* Removing whitespace at the beginning of the cookie name
        and compare it with the given string */
        if(name == cookiePair[0].trim()) {
            // Decode the cookie value and return
            return decodeURIComponent(cookiePair[1]);
        }
    } 
    // Return null if not found
    return null;
}

这是如何使用getCookie函数

var eventID = getCookie('fb-event-id')