set localstorage value

var testObject = { 'one': 1, 'two': 2, 'three': 3 };

// Put the object into storage
localStorage.setItem('testObject', JSON.stringify(testObject));

// Retrieve the object from storage
var retrievedObject = localStorage.getItem('testObject');

console.log('retrievedObject: ', JSON.parse(retrievedObject));

localStorage.setItem("mytime", Date.now());

function set(){
    var sendJson = JSON.stringify(arrayName);
    localStorage.setItem('key',sendJson)
}