允许session共享后,ajax请求产生了新的session_id

<code>var xhr = new XMLHttpRequest();  
xhr.open("POST", "http://xxxx.com/demo/b/index.php", true);  
xhr.withCredentials = true; //支持跨域发送cookies
xhr.send();</code>

<code> $.ajax({
    type: "POST",
    url: "http://xxx.com/api/test",
    dataType: 'jsonp',
    xhrFields: {withCredentials: true},
    crossDomain: true,
})</code>

<code>header("Access-Control-Allow-Credentials: true");
header("Access-Control-Allow-Origin: http://www.xxx.com");</code>