用JS读取XML文件

做一个菜单,需要读取服务器端的XML文件,然后根据XML文件内容拼成菜单.

var docMenu=new ActiveXObject("Microsoft.XMLDOM"); //创建XmlDom对象
docMenu.async=true; //使用异步加载
docMenu.onreadystatechange=LoadedMenu;

function LoadMenuDoc()
{
    var Url="Xml/pageMenu.xml";
    docMenu.load(Url);
}

function LoadedMenu()
{
    var txt="<table cellspacing=\"1\" class=\"grid fixed\"><tr><td class=\"category hand\">未加载!</td></tr></table>"
    if(docMenu.readyState==4)
    {
        txt = "";
        if(docMenu.parseError.errorCode != 0) 
        {
            txt="Error";
        }
        else
        {
            var parents = docMenu.documentElement.selectNodes("ParentMenu");
            if(parents != null && parents.length > 0)
            {
                for(var i=0;i<parents.length;++i)
                {
                    if(parents[i].getAttribute("Active") == 0)
                    {
                        txt += "<table cellspacing=\"1\" class=\"grid fixed\"><tr><td class=\"category linkdisable\">≡ { " + parents[i].getAttribute("Name") + " } ≡</td></tr></table><table cellspacing=\"0\"><tr><td colspan=\"3\" style=\"height: 1px;\"><img alt=\"\" src=\"images/blank.gif\" /></td></tr></table>";
                        continue;
                    }
                    else
                    {
                        txt += "<table cellspacing=\"1\" class=\"grid fixed\"><tr><td class=\"category hand\" onclick=\"collapse('menu_"+ i +"')\">≡ { " + parents[i].getAttribute("Name") + " } ≡</td></tr><tr id=\"menu_" + i + "\"><td class=\"items\"><ul>";
                    }
                    var children  = parents[i].childNodes;
                    if(children != null && children.length > 0)
                    {
                        for(var j=0;j<children.length;++j)
                        {
                            if(children[j].getAttribute("Active") == 0)
                            {
                                txt += "<li class=\"linkdisable\">" + children[j].getAttribute("Name") + "</li>";
                            }
                            else
                            {
                                txt += "<li><a href=\"" + children[j].getAttribute("Url") + "\">" + children[j].getAttribute("Name") + "</a></li>";
                            }
                        }
                    }
                    else
                    {
                        txt += "<li><a href=\"#\"></a></li>";
                    }
                    txt += "</ul></td></tr></table><table cellspacing=\"0\"><tr><td colspan=\"3\" style=\"height: 1px;\"><img alt=\"\" src=\"images/blank.gif\" /></td></tr></table>";
                }
            }  
        }
    }
    else
    {
        txt="<table cellspacing=\"1\" class=\"grid fixed\"><tr><td class=\"category hand\">Loading</td></tr></table>";
    }
    leftBar.innerHTML = txt;
}