Storing sensitive data on local machine could be dangerous and could leave a security hole. The Session Storage Data would be deleted by the browser immediately after the session gets terminated.
To clear a local storage setting you would need to call localStorage.remove('key'); where 'key' is the key to the value you want to remove. If you want to clear all settings, you need to call localStorage.clear() method.
<!DOCTYPE HTML>
<html>
<body>
<script>
localStorage.clear();
// Reset number of hits.
if( localStorage.hits ){
localStorage.hits = Number(localStorage.hits) +1;
} else{
localStorage.hits = 1;
}
document.write("Total Hits :" + localStorage.hits );
</script>
<p>Refreshing the page would not to increase hit counter.</p>
<p>Close the window and open it again and check the result.</p>
</body>
</html>