I cannot stop an ajax request using jQuery and abort() function

问题

My jQuery is below:

var x = $.ajax({
    dataType: "jsonp",
    url: "https://ajax.googleapis.com/ajax/services/search/images?q=google&v=1.0",
    success: function(msg){
       alert( "Jsonp data: " + msg );
    }
});

alert(x);  // x is undefined
// x.abort()​​

​

You can try this code here: http://jsbin.com/iyile3/2/edit

I want stop this ajax request and stop this ajax request's success function.

But what I get is that "x" is undefined , I think I doesn't stop this ajax request and its success function.

So can anyone help me?

Thank you very much!

回答1:

Well that makes sense.

A jsonp call is not an ordinary XMLHttpRequest (which .ajax() normally returns). It would not work that way since you cannot break out the same origin policy.

JSON-Padding works with dynamic script tag insertion. So basically, jQuery just creates a <script> tag on your site and loads the data over that. No XHR object at all.

I don't think there is a way to early abort that kind of request, but I hope someone will correct me here if I'm wrong.

回答2:

I think the documentation may be a little misleading on this one. No AJAX request is made when using JSONP. In this case, the ajax function returns an undefined value instead of the object of XMLHTTPRequest.

来源：https://stackoverflow.com/questions/4162261/i-cannot-stop-an-ajax-request-using-jquery-and-abort-function