@Override
    public String select(String text) {
        for (Selector selector : selectors) {
            String result = selector.select(text);
            if (result != null) {
                return result;
            }
        }
        return null;
    }
All extractors will do extracting separately, <br>
and the results of extractors will combined as the final result.
@author code4crafter@gmail.com <br>
@since 0.2.0
webmagic-core/src/main/java/us/codecraft/webmagic/selector/OrSelector.java