sessionStorage 、localStorage、cookie

Features	cookie	localStorage	sessionStorage
Storage	Browser side, same origin restriction	Browser side, same origin restriction	Browser side, same origin restriction
capacity	<=4K	5M~10M	5M~10M
Transmission	Like in requests initiated by web services, With cookies in http header content	Will not be sent to the server	Will not be sent to the server
Durable	You can set the timeout (expires)	Permanent, Manual or Code Clear	Clear immediately after closing window Even if they are different windows from the same origin
operate	No operation method, string operation method Format: "key=value;expires=time"	A set of operating methods setItem(), getItem(), removeItem(), clear() Also localStorage['key 1']='value 1'	Same as Zuo
event	none	setItem(), removeItem() Onstorage is triggered after clear() is called event	Same as Zuo

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