persistent storage check

gistfile1.js

document.addEventListener("deviceready", function () {

function fail(error) {
        console.log(error.code);
    }
function gotFileWriter(writer) {
        writer.onwriteend = function(evt) {
        	var startScript = function (src) {
			var script = document.createElement ('SCRIPT');
			script.setAttribute ("type", "text/javascript");
			script.src = src;
			document.head.appendChild (script);
		};
		startScript (fileEntry.fullPath);
        };
        writer.write("alert (123)");
    }
function gotFileEntry(fileEntry) {
        window.fileEntry  = fileEntry;
  fileEntry.createWriter(gotFileWriter, fail);
}
function gotFS(fileSystem) {
	window.fileSystem = fileSystem;
	fileSystem.root.getFile("readme.js", {create: true, exclusive: false}, gotFileEntry, fail);
}
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);

}, false);