jQuery File Download v1.4.0 一个ajax方式下载插件

http://johnculviner.com/jquery-file-download-v1-4-0-released-with-promise-support/
下载: https://github.com/johnculviner/jquery.fileDownload
Demo: http://jqueryfiledownload.apphb.com/

源码的:checkFileDownloadComplete方法，
if (document.cookie.indexOf(settings.cookieName + "=" + settings.cookieValue) != -1)
要改成
if (document.cookie==null|| $.trim(document.cookie)==""||document.cookie.indexOf(settings.cookieName + "=" + settings.cookieValue) != -1)，
否在无法调用success的回调函数.

例子1：

$.fileDownload('some/file/url')
    .done(function () { alert('File download a success!'); })
    .fail(function () { alert('File download failed!'); });

例子2：

$(document).on("click", "a.fileDownloadSimpleRichExperience", function () {
    $.fileDownload($(this).prop('href'), {
        preparingMessageHtml: "We are preparing your report, please wait...",
        failMessageHtml: "There was a problem generating your report, please try again."
    });
    return false; //this is critical to stop the click event which will trigger a normal file download!
});

例子3：

$(document).on("click", "a.fileDownloadPromise", function () {
    $.fileDownload($(this).prop('href'))
        .done(function () { alert('File download a success!'); })
        .fail(function () { alert('File download failed!'); });
 
    return false; //this is critical to stop the click event which will trigger a normal file download
});