Ajax-无法拨打电话

I have the following code:

function getChainDeals(chainID) {
    $('#loadingDiv1').show();
    var apiCode = * my unique api code * ;
    var imageURL;
    //Get relevant Image
    $.ajax({
        url: 'http://api.8coupons.com/v1/getchainstorelist?key=' + apiCode,
        dataType: 'jsonp',
        success: function (data) {

            $.each(data, function (key, value) {

                alert('key = ' + key);
                alert('chainid = ' + chainID);

                if (key === chainID - 1) {
                    alert('here');
                    imageURL = value.logoBig;
                    alert('imageURL = ' + imageURL);
                    return false;
                }
            });
            // hide the loading animation
            $('#loadingDiv1').hide();
        },
        statusCode: {
            404: function () {
                alert: ('There was a problem with the server');
            }
        }
    });
    alert(imageURL);
    alert(chainID);
}

For some reason however, the AJAX call is being skipped and only the final two alerts are being processed. I actually used almost identical code earlier in the program which worked fine...

Can anyone see what is going wrong here?

Thank you for your help.

You should put the alerts inside of the ajax callback because ajax is async:

function getChainDeals(chainID) {
    $('#loadingDiv1').show();
    var apiCode = * my unique api code * ;
    var imageURL;
    //Get relevant Image
    $.ajax({
        url: 'http://api.8coupons.com/v1/getchainstorelist?key=' + apiCode,
        dataType: 'jsonp',
        success: function (data) {

            $.each(data, function (key, value) {

                alert('key = ' + key);
                alert('chainid = ' + chainID);

                if (key === chainID - 1) {
                    alert('here');
                    imageURL = value.logoBig;
                    alert('imageURL = ' + imageURL);
                    return false;
                }
            });
            // hide the loading animation
            $('#loadingDiv1').hide();

            alert(imageURL);
            alert(chainID);
        },
        statusCode: {
            404: function () {
                alert: ('There was a problem with the server');
            }
        }
    });
}