how to set session storage in javascript

// Save data to sessionStorage
sessionStorage.setItem('key', 'value');

// Get saved data from sessionStorage
let data = sessionStorage.getItem('key');

// Remove saved data from sessionStorage
sessionStorage.removeItem('key');

// Remove all saved data from sessionStorage
sessionStorage.clear();
  localStorage.setItem("mytime", Date.now()); // Store
sessionStorage.setItem("lastname", "Smith");
// Retrieve

document.getElementById("result").innerHTML = sessionStorage.getItem("lastname"); 	var setsession = window.sessionStorage.setItem("animals", "cat");
	var getsession = window.sessionStorage.getItem("animals");
	console.log(getsession);