I'm trying to create a test array in localStorage but when I make it the result is null in every index.

My js file: 

```
var hola, probando;
var prueba = new Array (hola, probando);
localStorage.setItem("prueba", JSON.stringify(prueba));

```

As a result, localStorage store this: 

```
prueba: "[null, null]"

```

Somebody can help me? :(

Thank you,