Storage: setItem() method

The setItem() method of the Storage interface, when passed a key name and value, will add that key to the given Storage object, or update that key's value if it already exists.

Syntax 

setItem(keyName, keyValue)

Parameters

keyName

A string containing the name of the key you want to create/update.

keyValue
A string containing the value you want to give the key you are creating/updating.

Return value

None ( undefined ).

Exceptions

setItem() may throw an exception if the storage is full. Developers should make sure to always catch possible exceptions from setItem() .

Examples

The following function creates three data items inside local storage. 

function populateStorage() {
  localStorage.setItem("bgcolor", "red");
  localStorage.setItem("font", "Helvetica");
  localStorage.setItem("image", "myCat.png");