Remove / delete list item using client object model (ecma script) in sp 2010

How to delete / remove list item using client object model (ecma script) in sharepoint 2010?
ECMAscript is a kind of javascript or jquery.

Sample code demo:


function deleteProduct(productId) {
var itemid= "1";
    var context = new SP.ClientContext.get_current();
    var web = context.get_web();
    var list = web.get_lists().getByTitle('listname');
    var itemToDelete = list.getItemById(itemid);
    itemToDelete.deleteObject();
    context.executeQueryAsync(Function.createDelegate(this, this.success), Function.createDelegate(this, this.failed));
}

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