Add A List Item In SharePoint Using JSOM (Announcement List)

Steps

Code snippet

$(document).ready(function
{
deletelistitem();
});
function deletelistitem() {
var clientContext = new SP.ClientContext(https://gowtham.sharepoint.com/tutorials");
var oList = clientContext.get_web().get_lists().getByTitle('Announcements');
var itemCreateInfo = new SP.ListItemCreationInformation();
this.oListItem = oList.addItem(itemCreateInfo);
oListItem.set_item('Title', 'Test Item!');
oListItem.set_item('Body', 'This Item has added Programmatically!');
oListItem.update();
clientContext.load(oListItem);
clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}
function onQuerySucceeded() {
alert('Item created sucessfully: ' + oListItem.get_id());
}
function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}