AJAX请求：如何为未处理的HTTP状态代码实现“其他”条件？

Question

I am trying to react to the HTTP status codes in some AJAX. I am successful in reacting to specified status codes, but I do not want to have to check for every single one. Is there a way to write an else statement in the following code? Or does AJAX not do that?

$(function () {
    var url = "google.com";
    $.ajax(url,
            {
                statusCode: {
                    200: function () {
                        //react to status code 200
                    },
                    404: function () {
                        //react to status code 404
                    },
                    503: function () {
                        //react to status code 503
                    }
                    //if neither 200, 404, or 503, then react some way
                }
            });
});

I have tried writing else , using , , using nothing, etc. No success. And I don't think the generic switch statement will work with what I am trying to do.

Answer 1

Here's an example of how you can check the HTTP response code:

var xhr = new XMLHttpRequest();
xhr.onload = function()
{
  switch (this.status)
  {
    case 200: console.log("The file exists!"); break;
    case 404: console.log("The file does not exist."); break;
    default:  console.log("Something else happened..."); break;
  }
};
xhr.open("get", "http://localhost:3000/something.png", true);
xhr.responseType = "blob";
xhr.send();