Cordova remove file

I got it works :

function del() {

    window.resolveLocalFileSystemURL(cordova.file.externalDataDirectory, function (dir) {

        dir.getFile("log1.txt", {create: false}, function (fileEntry) {
            fileEntry.remove(function (file) {
                alert("file removed!");
            }, function (error) {
                alert("error occurred: " + error.code);
            }, function () {
                alert("file does not exist");
            });
        });
    });

}

Thanks