为了解决CSRF问题，我为Ajax使用了客户端设置：

$.ajaxSetup({
    beforeSend: function(xhr, settings) {
        function getCookie(name) {
            var cookieValue = null;
            if (document.cookie && document.cookie != '') {
                var cookies = document.cookie.split(';');
                for (var i = 0; i < cookies.length; i++) {
                    var cookie = jQuery.trim(cookies[i]);
                    // Does this cookie string begin with the name we want?
                    if (cookie.substring(0, name.length + 1) == (name + '=')) {
                        cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                        break;
                    }
                }
            }
            return cookieValue;
        }
        if (!(/^http:.*/.test(settings.url) || /^https:.*/.test(settings.url))) {
            // Only send the token to relative URLs i.e. locally.
            xhr.setRequestHeader("X-CSRFToken", getCookie('csrftoken'));
        }
    }
});

直到今天，一切正常。但是现在我需要在发布之前做一些检查：

var check;
//...
$.ajax({
    //...
    beforeSend: function(xhr){
        if (check == 1){
            xhr.abort();
        }
    },
    success: function(data){
        //...
    }
});

CSRF验证失败。请求中止。据我了解，我只是取消了ajaxSetup对新功能的操作。如何将这两件事结合起来？