问多个aSync ajax调用

EN

//setup an object to store the necessary info for each AJAX call
var setup = [
    {
        url      : WEB_ROOT + '/process/createKeywords',

        //the callback will be run before the next AJAX request is made
        callback : function (keywordsResponse) {
            $('#createKeywords').parent().children(0).children(0).hide();
            if (keywordsResponse.RESPONSE == "SUCCESS") {
                $('#createKeywords').html(img);
                $('#getTraffic').parent().children(0).children(0).show();
            }
        }
    },
    {
        url      : WEB_ROOT + '/process/getTraffic',
        callback : function () {
            $('#getTraffic').parent().children(0).children(0).hide();
            if (trafficResponse.RESPONSE == "SUCCESS") {
                $('#getTraffic').html(img);
                $('#getGoogleResults').parent().children(0).children(0).show();
            }
        }
    }
];

//setup a function that recursively calls itself when the current AJAX request comes back successfully
function doAJAX(index) {
    var val = setup[index];
    $.getJSON(val.url, function (serverResponse) {

        //run the specified callback for this AJAX request
        val.callback(serverResponse);

        //now check if the response is "SUCCESS" and make sure that another AJAX request exists in the `setup` object
        if (serverResponse.RESPONSE == 'SUCCESS' && typeof setup[(index + 1)] != 'undefined') {

            //since the last AJAX request was a success and there is another one set, run it now
            doAJAX(index + 1);
        }
    });
}

//run the first AJAX request by passing in zero (index)
doAJAX(0);