Session

  • Session: The entire process from opening a page of the WEB browser to closing the browser is called “a session between the browser and the WEB server”.

window.sessionStorage

  • Array object: session-level data storage that can be shared by the pages of this session and disappear when the browser closes.
	sessionStorage[key]=val; 	// Save a data
	sessionStorage.setitem(key,val); 	// Save a data
	var val = sessionStorage['key']; 	// Read a data
	var val= sessionStorage.getitem('key'); 	// Read a data
	sessionStorage.removeltem('key'); 	// Delete data
	sessionStorage.length; 	 	// Data length
	sessionStorage.key(i); 	// Get the i-th key
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Window.localstorage Stores objects locally (across sessions and stores)

  • The user data is stored in the managed external storage (disk) of the browser, which can be used by the pages of this session and subsequent sessions. Even if the browser is closed, it doesn’t go away — forever
	localStorage[key]=val; 	// Save a data
	localStorage.setitem(key,val); 	// Save a data
	var val = localStorage['key']; 	// Read a data
	var val= localStorage.getitem('key'); 	// Read a data
	localStorage.removeltem('key'); 	// Delete data
	localStorage.length; 	 	// Number of data
	localStorage.key(i); 	// Get the i-th key
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  • ** *localStorage () : window.onstorage () : window.onstorage () : window.onstorage () : window.onstorage ();