QueryResultIterator

Iterate over query results returned by the AJAX Toolkit without invoking queryMore and queryLocator.

1var result = sforce.connection.query("select id, name from account");
2    var it = new sforce.QueryResultIterator(result);
3
4    while (it.hasNext()) {
5        var account = it.next();
6        sforce.debug.log(account.Name);
7    }

The sforce.connection.query method returns a QueryResult object.
A QueryResultIterator object is created and passed the QueryResult object.
The code iterates through the records.