JavaScript XML解析

Question

the xml

<publication_date media_type="print">
        <month>1</month>
        <year>2011</year>
</publication_date>

I have used this code to get title

var year = $xml.find('publication_date year').text();

but sometimes the xml contains two different types like this:

<publication_date media_type="print">
        <month>05</month>
        <day>22</day>
        <year>2012</year>
</publication_date>
<publication_date media_type="online">
        <month>04</month>
        <day>26</day>
        <year>2012</year>
</publication_date>

I want to select the year witch comes with online media-type and if there is no online select print type.

Answer 1

很简单，使用属性选择器：

$xml.find("publication_date[media_type=online] year").text()