Web Local Storage (localstorage, sessionstorage)

For browsers, using Web Storage to store key values compared to storing cookies is more intuitive and more capacity, it contains two kinds: Localstorage and Sessionstorage

1. Sessionstorage (Temporary storage): maintains a storage area for each data source that exists during browser opening, including page reload

2. Localstorage (long-term storage): Same as Sessionstorage, but when the browser is closed, the data remains

1. Save data to Local

Sessionstorage.setitem (' key ', ' your Data ');

Localstorage.setitem (' key ', ' your Data ');

2. Getting data from local storage

var data1 = Json.parse (sessionstorage.getitem (' key '));

var data2 = Json.parse (localstorage.getitem (' key '));

3. Delete a saved data from the local store

Sessionstorage.removeitem (' key ');

Localstorage.removeitem (' key ');

4. Delete all saved data

Sessionstorage.clear ();

Localstorage.clear ();

5. Monitor changes to local storage

Description: Storage changes (add, update, delete) when the trigger, the same page changes will not trigger, will only listen to the same domain name other page changes Storage

Window.addeventlistener (' storage ', function (e) {

Console.log (' key ', e.key);

Console.log (' OldValue ', e.oldvalue);

Console.log (' newvalue ', e.newvalue);

Console.log (' url ', e.url);

})

6. Browser Viewing methods

1. Go to Developer tools

2. Select Application

3. Check the Local Storage and Session Storage on the left Storage

Web Local Storage (localstorage, sessionstorage)