为什么数据在ajax中显示未定义

Question

我正在调用ajax调用，其中向数组提供数据，当我要在控制台中调试此代码时向我显示data undefined为什么？

Answer 1

In the success function of your first ajax call, you have this:

success: function (response) {
    orderId = data;
    if (data != null) {
        orderStatus = "Order has been placed successfully.";
    }
}

Note that you've called the argument to the callback response , but then used data . The code as quoted should fail with a ReferenceError , because there's no data in scope in that callback (the only place you have var data is inside another callback). I assume you have it declared in code you haven't quoted.

I assume you meant response , not data :

success: function (response) {
    orderId = response;
    if (response != null) {
        orderStatus = "Order has been placed successfully.";
    }
}