var title = document.title;
        var url = window.location.href;
        var xhr = new XMLHttpRequest();  
        xhr.open("POST", "https://trail.53kf.com/code.php?cmd=ka &action=behavior", true);
        xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
        xhr.withCredentials = true; //支持跨域发送cookies
        xhr.send('title='+title+'&url='+url);