我 AJAX 调用和控制器非常陌生，请耐心等待。
我有一些客户端的JS，我需要添加一个 AJAX 调用更新一个布尔值为真，一旦一个按钮被点击
客户端JS：

$(document).on('click', '.add-to-cart', function(e) {
    $.ajax({
        url: url,
        type: 'post',
        data: true// but I do not know what goes here
    success:(function () {//dont know what response to put in
       //I know it handles response from server but what would I put in here to update 
    }).fail(function (err) {
        console.log({err});
    });
});

控制器：

server.post(
    'updateButtonAdded',
    function (req, res, next) {
        var addToCartButtonClicked = customer.profile.custom.AddButton;// declaring the custom attribute I want to show on a profile if the button is clicked       
        if (??) {
           // I know I need to add something here to have the logic of when the button gets clicked, set the addToCartButtonClicked = true to update to the customer profile and have it checked because I set as a boolean 
        }
    next();
    }
);

我试着填写我不明白的内容，如果可以的话请协助，当涉及到控制器和 AJAX 调用时，我非常困惑。越多的解释对我越好！