javascript - if I am using only integers as keys how can get last inserted key in localstorage? -

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i trying build registration form , using localstorage save details. while adding form details locastorage, want know value of last inserted key can increment , can insert new record incremented value of key.

how can done. current code overwriting values if delete record, since taking count of keys available in storage.

      function setlocal(){       var o = {};       var ff = $('#myform').serializearray();        $.each(ff, function() {           if (o[this.name] !== undefined) {               if (!o[this.name].push) {                   o[this.name] = [o[this.name]];               }               o[this.name].push(this.value || '');           } else {               o[this.name] = this.value || '';           }       });       var tt = json.stringify(o);       localstorage.setitem(localstorage.length+1, tt);       $('#afterinsert').text('data added sucessfully');       return true;   }

any suggestions?

why can't store last inserted key in separate property

var lastkey = parseint(localstorage.getitem('lastkey')); var newkey = lastkey + 1 || 1; localstorage.setitem(newkey , tt); localstorage.setitem('lastkey', newkey);

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