javascript - Arrays and Localstorage -

i'm having little problem here, have array this:

function crearobjetos() {   var palabrapeso = "peso";   var palabrafecha = "fecha";   var localstoragekey000 = "objetospesofecha";   var contador = 0;   var pesofecha = new array(); //the array    while(contador < 365)   {       var nuevoobjeto = new object;       var fechaactual = new date();       nuevoobjeto.peso = 0;       nuevoobjeto.fecha = fechaactual;       nuevoobjeto.id = contador;        pesofecha[contador] = nuevoobjeto; //save objects in array       contador = contador +1;    }   if (modernizr.localstorage)    {     localstorage.setitem(localstoragekey000, pesofecha); //storage array   } } 

the problem that, when try load array in local storage, can't acces data, "undefined" , don't know why... here how load data array (in case first objetc):

function dameprimerobjetopesofecha() {    //load array local storage    var localstoragekey000 = "objetospesofecha";    var arraydeobjetos = localstorage.getitem(localstoragekey000);     //check in alert if data ok    alert("el primero que devuelve"+arraydeobjetos[0].id);     //return firstone    return arraydeobjetos[0]; } 

an array can't pushed localstorage how is. have use json.stringify on it. line :

localstorage.setitem(localstoragekey000, pesofecha); 

must changed to

localstorage.setitem(localstoragekey000, json.stringify(pesofecha));  

similarly, when you're retrieving localstorage, must use json.parse on convert json. line :

 var arraydeobjetos = localstorage.getitem(localstoragekey000); 

must :

 var arraydeobjetos = json.parse(localstorage.getitem(localstoragekey000)); 

now when access first data, wont undefined.

another alternative jstorage plugin wrapper around localstorage. take parsing problems , if pass array or object it.

hope helps!