javascript storage get set item

1var testObject = { 'one': 1, 'two': 2, 'three': 3 };
2
3// Put the object into storage
4localStorage.setItem('testObject', JSON.stringify(testObject));
5
6// Retrieve the object from storage
7var retrievedObject = localStorage.getItem('testObject');
8
9console.log('retrievedObject: ', JSON.parse(retrievedObject));

1// *** JS Storage Get/Set item *** 
2
3	let target = document.getElementById("target");
4    let increment = document.getElementById("increment");
5    let count = localStorage.getItem("counter") || 0;
6    target.innerHTML = count;
7
8    increment.addEventListener("click", () => {
9        count++;
10        localStorage.setItem("counter", count);
11        target.innerHTML = count;
12    })

1function set(){
2    var sendJson = JSON.stringify(arrayName);
3    localStorage.setItem('key',sendJson)
4}