add new list item using client object model in sp 2010

How to add / create new list item using client object model (ecma script) in sharepoint 2010?

ECMAscript is a kind of javascript or jquery.

Sample code demo:

function addProduct() {
    try {
var itemname= "Mame 1";
var itemdesc="item desc1;";
        var context = new SP.ClientContext.get_current();       
        var web = context.get_web();
        var list = web.get_lists().getByTitle('listname');

        var listItemCreationInfo = new SP.ListItemCreationInformation();
        var newItem = list.addItem(listItemCreationInfo);
        newItem.set_item('ItemName', itemname);
        newItem.set_item('ItemDesc', itemdesc);
     
        newItem.update();
        context.executeQueryAsync(Function.createDelegate(this, this.success), Function.createDelegate(this, this.failed));
    }
    catch (e) {
        alert('error:' + e.Message);
    }
}

function success() {
    alert('success');
}
function failed(sender, args) {
    alert('failed. Message:' + args.get_message());
}