variable using local storage code example
Example 1: how to add variable to local storage in javascript
localStorage.setItem('key', 'value')
Example 2: how to get data from localstorage in javascript
//localStorage is an object, so values are stored by key name
//data from localStorage is always stored in strings
//usually the values at each key are stringified objects in JSON format, therefore we must parse them
var data = JSON.parse(localStorage.getItem("key name"));//make sure the "key name" exists in the localStorage