データストレージの3つの方法、Cookie sessionstorage localstorageの類似点と相違点の分析

var dataCookie='110';
    document.cookie = 'token' + "=" +dataCookie;

function getCookie(name) 
{ // Get the cookie value for the specified name
// (^| )name=([^;]*)(;|$), match[0] is the string that matches the entire regular expression, match[i] is the array of regular expression captures that match the array.
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)")));
if(arr ! = null) {
  console.log(arr);
  return unescape(arr[2]);
}
return null;
}
 var cookieData=getCookie('token'); //cookie assignment to variable.

function setTime() 
{

//store the cookie value and set the cookie expiration time

var date\=new Date();

var expiresDays\=10;//set ten days to expire

date.setTime(date.getTime()+expiresDays\*24\*3600\*1000);

document.cookie\="userId=828; 
expires="+date.toGMTString();

console.log(document.cookie,'Store cookie value and set cookie expiration time');

}

setTime();

function delCookie(cookieName1) {

//delete the cookie

var date2\=new Date();

date2.setTime(date2.getTime()\-10001);//set the time to the past and it will be automatically deleted

document.cookie\= cookieName1+"=v; expires="+date2.toGMTString();

console.log(document.cookie,'delete cookie');

}
delCookie('userId');

var name='sessionData';
var num=120;
sessionStorage.setItem(name,num);//store data
sessionStorage.setItem('value2',119);
let dataAll=sessionStorage.valueOf();//get all data
console.log(dataAll,'Get all data');
var dataSession=sessionStorage.getItem(name);//Get the specified key name data
var dataSession2=sessionStorage.sessionData;//sessionStorage is a js object, you can also use the key to get the value
 console.log(dataSession,dataSession2,'Get the specified key name data');
 sessionStorage.removeItem(name); //delete the specified key name data
 console.log(dataAll,'Get all data1');
 sessionStorage.clear();//clear the cached data: localStorage.clear();
 console.log(dataAll,'Get all data 2');

if(navigator.cookieEnabled) 
{
  alert("Your browser supports the cookie feature");// Prompt your browser to support cookies  
} 
else 
{
  alert("Your browser does not support cookies");//prompts the browser not to support cookies  
 }