developer site office 365

please find the below code for retrieving items


function getitems() {
  
    var selectedListTitle = web.get_lists().getByTitle(listname); 
    var camlQuery = new SP.CamlQuery();
   
    camlQuery.set_viewXml("" +
        "" +
        "" +
        "5')");
       
       
    listItemCollection = selectedListTitle.getItems(camlQuery);
    context.load(listItemCollection, "Include(Title, ID)");
    context.executeQueryAsync(onGetItemsSuccess, onGetItemsFail);
}

function onGetItemsSuccess(sender, args) {
    // The list items were retrieved.
    // Show all child nodes.
    var listItemEnumerator = listItemCollection.getEnumerator();
    var selectItemBox = document.getElementById("selectitembox");
    if (selectItemBox.hasChildNodes()) {
        while (selectItemBox.childNodes.length >= 1) {
     selectItemBox.removeChild(selectItemBox.firstChild);
        }
    }
        while (listItemEnumerator.moveNext()) {
            var selectOption = document.createElement("option");
            selectOption.value = listItemEnumerator.get_current().get_item('ID');
            selectOption.innerHTML = listItemEnumerator.get_current().get_item('Title');
            selectItemBox.appendChild(selectOption);
        }
}

function onGetItemsFail(sender, args) {
    // The list items couldn't be retrieved - display an error message.
    alert('Failed to get items. Error: ' + args.get_message());
}

You can below link 

http://msdn.microsoft.com/en-us/library/office/jj163201(v=office.15).aspx

It has sample example for retrieving list items using javascript client object model .

Best 
M