Storage objects are simple key-value stores, similar to objects, but they stay intact through page loads. The keys and the values are always strings (note that integer keys will be automatically converted to strings, just like what object do). You can access these values like an object, or with the getItem() and setItem() methods. These three lines all set the colorSetting entry in the same way:
The update() method of the IDBCursor interface returns an IDBRequest object, and, in a separate thread, updates the value at the current position of the cursor in the object store. If the cursor points to a record that has just been deleted, a new record is created.
The connection is not actually closed until all transactions created using this connection are complete. No new transactions can be created for this connection once this method is called. Methods that create transactions throw an exception if a closing operation is pending.
The method takes the name of the store as well as a parameter object that lets you define important optional properties. You can use the property to uniquely identify individual objects in the store. As the property is an identifier, it should be unique to every object, and every object should have that property.