读xml文件 的值

[lenovo123]

js:
<script>
loadXML = function(xmlFile)
{
var xmlDoc;
if(window.ActiveXObject)
{
xmlDoc = new ActiveXObject('Microsoft.XMLDOM');
xmlDoc.async = false;
xmlDoc.load(xmlFile);
}
else if (document.implementation&&document.implementation.createDocument)
{
xmlDoc = document.implementation.createDocument('', '', null);
xmlDoc.load(xmlFile);
}
else
{
return null;
}

return xmlDoc;
}

var xmlDoc = loadXML('1.xml');

var v = 这里该如何写
alert(v)
</script>

xml:
<?xml version="1.0" encoding="utf_8"?>
<root>
<title name="aa">rrrrrrrrrrrrrrrrr</title>
<title name="bb">假如乔峰穿越到多情</title>
<title name="cc">[乱弹]小说《鹿鼎记》里面阿珂在和小宝之前，有没有失身给郑克爽？？</title>
<title name="dd">[评论]上海诸翟关帝庙举行大型祈福法会 祈国泰民安</title>

</root>

</script>

如何根据 title中的name值 得到title中的值
比如我传aa,得到"rrrrrrrrrrrrrrrrr"

[abcd_ufo]

xmldoc.getElementsByTagName('root').

function getvalue(obj,name)
{
var titles=obj.getElementsByTagName("title");
for(var i=0;i<titles.length;i++)
{
var title=titles[i];
if(title.name==name)
{
return title.innerHTML;
}
}
}
getvalue(xmlDoc,"aa")

[qiqittjj]

来学习一下！