adding more than one list item into List at a time when the items are generated dynamically (using NAPA)

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Javascript

jQuery

SharePoint

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I am using the below code to insert an item into the list.

function createitem() {
     var selectListBox = document.getElementById("txtFormName");
     var selectedListTitle = selectListBox.value;
     var selectedList = web.get_lists().getByTitle(selectedListTitle);

     var listItemCreationInfo = new SP.ListItemCreationInformation();
     var newItem = selectedList.addItem(listItemCreationInfo);

     newItem.set_item('Title','abc');
     newItem.update();
     context.load(newItem);
     context.executeQueryAsync(onItemCreationSuccess, onItemCreationFail);
     }

Its working fine. Now I want to use

newItem.set_item('Title','abc')

in loop for more than one item in the same row to insert. How can i achieve that. kindly guide.