mozilla中使用xpath的selectNodes()等方法

来自于：麦盾http://dev.iseasky.com

var isMozilla = (true && document.implementation &&
                 document.implementation.createDocument);
var XML_COMPATIBLE;
//window.onerror = function(){return true;};
if(isMozilla && !XML_COMPATIBLE) {
    isMozilla = true;
    Element.prototype.__defineGetter__("text", function () { return this.firstChild.nodeValue; });
    Element.prototype.__defineGetter__("xml", function () {
      return (new XMLSerializer()).serializeToString(this);
    }
);
    Element.prototype.selectSingleNode = function(xPath) {
        var xPath;
        var xresult = this.ownerDocument.evaluate(xPath, this
            //this.ownerDocument.createNSResolver(this.ownerDocument.documentElement)
            , null
            , XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        if(xresult && xresult.snapshotLength > 0) {
            return xresult.snapshotItem(0);
        } else {
            return null;
        }
    }
    Element.prototype.selectNodes = function(xPath) {
        var xPath;
        var xresult = this.ownerDocument.evaluate(xPath, this
           //this.ownerDocument.createNSResolver(this.ownerDocument.documentElement)
            , null
            , XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
        var nod = null, nods = [], k = 0;
        while((nod=xresult.iterateNext())!=null) {
            nods[k++] = nod;
        }
        return nods;
    }
    XMLDocument.prototype.selectSingleNode = function(xPath) {
        var xPath;
        var xresult = this.evaluate(xPath, this
            , null//this.createNSResolver(this.documentElement)
            , XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        if(xresult && xresult.snapshotLength > 0) {
            return xresult.snapshotItem(0);
        } else {
            return null;
        }
    }
    XMLDocument.prototype.selectNodes = function(xPath) {
        var xPath;
        var xresult = this.evaluate(xPath, this
            , null//this.createNSResolver(this.documentElement)
            , XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
        var nod = null, nods = [], k = 0;
        while((nod=xresult.iterateNext())!=null) {
            nods[k++] = nod;
        }
        return nods;
    }
    XML_COMPATIBLE = true;
}

// http
var xpool=[], xmethod="POST";
// isb = 1     :: function(body, status, flag{application|image|video|audio}, headers)
function xsend(url, func, param, win, async, isb) {
    var param, url, func, win, async, isb;
    var xob;
    for(var k=0; k<xpool.length; k++) {
        // 0=uninitialized,1=loading,2=loaded,3=interactive,4=complete
        if(xpool[k].readyState==4||xpool[k].readyState==0) xob = xpool[k];
    }
    if(!xob) {
        if(window.XMLHttpRequest) {
            xob = new window.XMLHttpRequest();
        } else {
            var axo = ["Msxml2.XMLHTTP.6.0","Msxml2.XMLHTTP.4.0",
                       "Msxml2.XMLHTTP","Microsoft.XMLHTTP"];
            var j = 0, jmax = axo.length; while(j<jmax) {
              try{
                xob=new ActiveXObject(axo[j++]);
                if(xob) break;
              }catch(e){}
           }
        }
        if(xob) xpool[xpool.length] = xob;
    }
    var xvalid = false, xerr = "unknow error";
    var ctyp = "application/x-www-form-urlencoded";
    if(xob) {
        if(!xmethod) xmethod = "POST";
        xmethod = xmethod.toUpperCase();
        if(param && typeof(param)=="string" && param.indexOf("=")<0) {
            if(!win) win = window;
            var fm = win.document.forms[param];
            if(fm) {
                var els = fm.elements;
                var d = [], kmax=els.length;
                for(var k=0; k<kmax; k++) {
                    if(els[k].name) { d[d.length]= els[k].name +"=" +encodeURI(els[k].value); }
                }
                if(!url) url = fm.action;
                if(fm.method) method = fm.method;
                if(fm.enctype) ctyp = fm.enctype;
                param = d.join("&");
                xvalid = true;
            } else {
                xerr = "form '"+param+"' not found";
            }
        } else {
            if(url) { xvalid = true; } else { xerr = "unknow action"; }
        }
    } else {
        xerr = "no xmlhttp prepared";
    }
    if(xvalid) {
        xob.onreadystatechange = function() {
            if(xob.readyState==4) {
                if(func) {
                    try {
                        if(isb) {
                            var ct = xob.getResponseHeader("Content-Type");
                            func(xob.responseBody, xob.status
                                , (ct&&(ct.indexOf("application")==0||ct.indexOf("audio")==0
                                        ||ct.indexOf("video")==0||ct.indexOf("image")==0)?1:0)
                                , xob.getAllResponseHeaders());
                        } else {
                            func({"status":xob.status, "text":xob.responseText
                                , "body":xob.responseBody,
                                "headers":xob.getAllResponseHeaders()});
                        }
                    } catch(e) {
                        func(xob);
                    }
                }
                xob.abort();
            }
        };
        xob.open(xmethod, url, (async?1:0));
        //xob.setRequestHeader("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg
        // , application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*");
        xob.setRequestHeader("Content-Type", ctyp+'; charset=UTF-8'); // request.characterEncoding
        if(!param) param = null;
        xob.send(param);
        return xob;
    }
    if(xerr) alert("xsend::" +xerr);
    return null;
}

/* xml´¦m */
var doxbuff;
function xdoc(u, xmlldr) {
    var u, xmlldr, flag;
    flag = (xmlldr?true:false);
    if (window.ActiveXObject) {
        doxbuff = new ActiveXObject("Microsoft.XMLDOM");
        doxbuff.setProperty("SelectionLanguage", "XPath");
        doxbuff.async=flag;
        doxbuff.onreadystatechange = function (ob) {
            if(dox.readyState == 4) { if(xmlldr && typeof(xmlldr) == "function") { xmlldr(doxbuff); }}
        };
    } else {
        doxbuff = document.implementation.createDocument("", "mindon", null);
        doxbuff.async=flag;
        doxbuff.addEventListener('load', function(evt) {
            if(xmlldr && typeof(xmlldr) == "function") {
                xmlldr(doxbuff);
            }
        }, false);
    }
    if(doxbuff) {
        if(u.substr(0,1)=="<") {
            if(document.all) doxbuff.loadXML(u);
        } else {
            doxbuff.load(u);
        }
        return doxbuff;
    } else { return null; }
}