Ajax请求。哪个回调是先完成还是成功执行的?

我可以用这个来找出答案,但我会用它的。在我的单元测试(qunit)中,我使用 asynchShould (AsynchTest的别名)测试。断言的一部分是等待请求的完成/成功。这样地:

asyncShould('talk to customer list server', 1, function() {
    stop(2000);
    var forCustomerList = newCustomerListRequest();

    forCustomerList.page = 'helpers/helper.php';
    forCustomerList.data += '&action=customerListServer&DB=11001';
    var originalSuccess = forCustomerList.success;

    forCustomerList.success = function(msg) {
        if (msg.flash !== undefined && msg.data !== undefined && msg.status !== undefined) {
            ok(true, 'json structure correct')
        }
        else {
            ok(false, 'json structure not correct');
        }
        originalSuccess(msg);
        start();
    };

    testController.getServerData(forCustomerList);
})