4. Differences between cookies, sessionStorage, and localStory

Differences between cookies, sessionStorage, and localStory

cookie, sessionSttorage, localStoryare storage mechanisms that store key-value pairs on the client side, and can only store values ​​as strings

	cookie	localStorage	sessionStorage
who is initialized by	Client or server, the server can use the Set-Cookie request header.	client	client
Expiration	manual setting	never expires	When the current page is closed
Whether to persist in the current browser session (browser sessions)	Depends on whether an expiration time is set	Yes	no
Is it associated with a domain name	Yes	no	no
whether to send to the server with every HTTP request	Yes, Cookies will be automatically sent to the server through the Cookie request header	no	no
Capacity (per domain name)	4kb	5MB	5MB
access permission