Web Local Storage (localstorage, sessionstorage)

Web Local Storage (localstorage, sessionstorage) description

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 the data will persist after the browser is closed

Api

The usage of sessionstorage and localstorage is basically consistent, and the value of the reference type is converted to JSON

1. Save data to Local

    const info = {        name: ‘Lee‘,        age: 20,        id: ‘001‘    };    sessionStorage.setItem(‘key‘, JSON.stringify(info)); localStorage.setItem(‘key‘, JSON.stringify(info));

• 1
• 2
• 3
• 4
• 5
• 6
• 7

2. Getting data from local storage

    var data1 = JSON.parse(sessionStorage.getItem(‘key‘));    var data2 = JSON.parse(localStorage.getItem(‘key‘));

• 1
• 2

3. Delete a saved data from the local store

    sessionStorage.removeItem(‘key‘);    localStorage.removeItem(‘key‘);

• 1
• 2

4. Delete all saved data

    sessionStorage.clear();    localStorage.clear();

• 1
• 2

5. Monitor changes to local storage

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); })

Web Local Storage (localstorage, sessionstorage)