downloadFile.js

function downloadFile()
{
    window.requestFileSystem(
        LocalFileSystem.PERSISTENT, 0, 
        function onFileSystemSuccess(fileSystem) {
            fileSystem.root.getFile(
            "dummy.html", {create: true, exclusive: false}, 
            function gotFileEntry(fileEntry) {
                var sPath = fileEntry.fullPath.replace("dummy.html","");
                var fileTransfer = new FileTransfer();
                fileEntry.remove();

                fileTransfer.download(
                    "http://www.w3.org/2011/web-apps-ws/papers/Nitobi.pdf",
                    sPath + "theFile.pdf",
                    function(theFile) {
                        console.log("download complete: " + theFile.toURI());
                        showLink(theFile.toURI());
                    },
                    function(error) {
                        console.log("download error source " + error.source);
                        console.log("download error target " + error.target);
                        console.log("upload error code: " + error.code);
                    }
                );
            }, fail);
        }, fail);
    };
}