您不能跨域共享cookie。但是，您可以允许所有子域具有访问权限。若要允许example.com的所有子域具有访问权限，请将域设置为.example.com。

这是不可能的。例如访问example.com的cookie。

function GetOrder(status, filter) {
    var isValid = true; //isValidGuid(customerId);
    if (isValid) {
        var refundhtmlstr = '';
        //varsURL = ApiPath + '/api/Orders/Customer/' + customerId + '?status=' + status + '&filter=' + filter;
        varsURL = ApiPath + '/api/Orders/Customer?status=' + status + '&filter=' + filter;
        $.ajax({
            type: "GET",
            //url: ApiPath + '/api/Orders/Customer/' + customerId + '?status=' + status + '&filter=' + filter,
            url: ApiPath + '/api/Orders/Customer?status=' + status + '&filter=' + filter,
            dataType: "json",
            crossDomain: true,
            xhrFields: {
                withCredentials: true
            },
            success: function (data) {
                var htmlStr = '';
                if (data == null || data.Count === 0) {
                    htmlStr = '<div class="card"><div class="card-header">Bu kriterlere uygun sipariş bulunamadı.</div></div>';
                }
                else {
                    $('#ReturnPolicyBtnUrl').attr('href', data.ReturnPolicyBtnUrl);
                    var groupedData = data.OrderDto.sort(function (x, y) {
                        return new Date(y.OrderDate) - new Date(x.OrderDate);
                    });
                    groupedData = _.groupBy(data.OrderDto, function (d) { return toMonthStr(d.OrderDate) });
                    localStorage['orderData'] = JSON.stringify(data.OrderDto);

                    $.each(groupedData, function (key, val) {

                        var sortedData = groupedData[key].sort(function (x, y) {
                            return new Date(y.OrderDate) - new Date(x.OrderDate);
                        });
                        htmlStr += '<div class="card-header">' + key + '</div>';
                        $.each(sortedData, function (keyitem, valitem) {
                            //Date Convertions
                            if (valitem.StatusDesc != null) {
                                valitem.StatusDesc = valitem.StatusDesc;
                            }

                            var date = valitem.OrderDate;
                            date = date.substring(0, 10).split('-');
                            date = date[2] + '.' + date[1] + '.' + date[0];
                            htmlStr += '<div class="col-lg-12 col-md-12 col-xs-12 col-sm-12 card-item clearfix ">' +
                        //'<div class="card-item-head"><span class="order-head">Sipariş No: <a href="ViewOrderDetails.html?CustomerId=' + customerId + '&OrderNo=' + valitem.OrderNumber + '" >' + valitem.OrderNumber + '</a></span><span class="order-date">' + date + '</span></div>' +
                        '<div class="card-item-head"><span class="order-head">Sipariş No: <a href="ViewOrderDetails.html?OrderNo=' + valitem.OrderNumber + '" >' + valitem.OrderNumber + '</a></span><span class="order-date">' + date + '</span></div>' +
                        '<div class="card-item-head-desc">' + valitem.StatusDesc + '</div>' +
                        '<div class="card-item-body">' +
                            '<div class="slider responsive">';
                            var i = 0;
                            $.each(valitem.ItemList, function (keylineitem, vallineitem) {
                                var imageUrl = vallineitem.ProductImageUrl.replace('{size}', 200);
                                htmlStr += '<div><img src="' + imageUrl + '" alt="' + vallineitem.ProductName + '"><span class="img-desc">' + ProductNameStr(vallineitem.ProductName) + '</span></div>';
                                i++;
                            });
                            htmlStr += '</div>' +
                        '</div>' +
                    '</div>';
                        });
                    });

                    $.each(data.OrderDto, function (key, value) {
                        if (value.IsSAPMigrationflag === true) {
                            refundhtmlstr = '<div class="notify-reason"><span class="note"><B>Notification : </B> Geçmiş siparişleriniz yükleniyor.  Lütfen kısa bir süre sonra tekrar kontrol ediniz. Teşekkürler. </span></div>';
                        }
                    });
                }
                $('#orders').html(htmlStr);
                $("#notification").html(refundhtmlstr);
                ApplySlide();
            },
            error: function () {
                console.log("System Failure");
            }
        });
    }
}

. config

包括UI原点和设置允许凭据为真

<httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="http://burada.com" />
        <add name="Access-Control-Allow-Headers" value="Content-Type" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
        <add name="Access-Control-Allow-Credentials" value="true" />
      </customHeaders>
    </httpProtocol>

你可以使用隐形的iframe来获取cookie。假设有两个定义域，a。example和b。example。对于a.example域的index.html，可以添加(注意height=0 width=0):

<iframe height="0" id="iframe" src="http://b.example" width="0"></iframe>

这样，您的网站将获得b.example cookie，假设http://b.example设置了cookie。

下一件事是通过JavaScript在iframe中操作站点。如果不拥有第二个域，iframe内部的操作可能会成为一个挑战。但是，如果能够访问这两个域，在iframe的src中引用正确的网页应该会给出一个想要获得的cookie。

据我所知，cookie受到“同源”策略的限制。但是，使用CORS，您可以接收和使用“服务器B”cookie，在“服务器B”上从“服务器a”建立持久会话。

尽管，这需要在“服务器B”上设置一些头文件:

Access-Control-Allow-Origin: http://server-a.example.com
Access-Control-Allow-Credentials: true

你将需要在所有的“服务器A”请求(例如:xhr)上发送“withCredentials”标志。withCredentials = true;)

你可以在这里阅读:

http://www.html5rocks.com/en/tutorials/cors/

https://developer.mozilla.org/en-US/docs/HTTP/Access_control_CORS

没有所谓的跨域cookie。您可以在foo.example.com和bar.example.com之间共享cookie，但绝不可以在example.com和example2.com之间共享cookie，这是出于安全原因。

最聪明的解决办法就是效仿facebook的做法。当你访问任何域名时，facebook如何知道你是谁?其实很简单:

The Like button actually allows Facebook to track all visitors of the external site, no matter if they click it or not. Facebook can do that because they use an iframe to display the button. An iframe is something like an embedded browser window within a page. The difference between using an iframe and a simple image for the button is that the iframe contains a complete web page – from Facebook. There is not much going on on this page, except for the button and the information about how many people have liked the current page.

所以当你在cnn.com上看到一个“喜欢”按钮时，你实际上是在同时访问一个Facebook页面。这使得Facebook可以读取你电脑上的cookie，这些cookie是它在你上次登录Facebook时创建的。

每种浏览器的一个基本安全规则是，只有创建了cookie的网站以后才能读取它。这就是iframe的优势:它允许Facebook读取你的Facebook-cookie，即使你在访问另一个网站。这就是他们如何在cnn.com上认出你，并在那里展示你的朋友。

来源:

http://dorianroy.com/blog/2010/04/how-facebooks-like-button-works/ https://stackoverflow.com/a/8256920/715483