100分求人看一个<javascript高级程序设计>>书的上错误!!!!!

也就是说:程序执行到:oXmlDom.load("test.xml");这一句的时候,会调用load()方法,因为我之前把
load()方法重写了,按照道理来说应当执行:this.__initError__();才对,但是没有执行啊?我又在
this.__initError__();之前加一句alert("test");看一下能不能输出,测试的结果还是不能输出.
如下:    Document.prototype.__load__ = Document.prototype.load;//更新Mozilla的load信息
        Document.prototype.load = function(sRUL)//更新Mozilla的load信息
        {
            this.__initError__();
            this.__changeReadyState__(1);
            this.__load__(sRUL);
        }
        Node.prototype.__defineGetter__("xml",function()//为每个节点添加xml特性,以便和IE实现一样
        {
            var oSerializer = new XMLSerializer();
            return oSerializer.serializeToString(this,"text/xml");
        });
    }

<html>
    <head>
        <title>Test</title>
<script language = "javascript" >
  function XmlDom() {
    //通过对象/属性检测法，判断是IE来是Mozilla
    if (window.ActiveXObject) {
        var arrSignatures = ["MSXML2.DOMDocument.5.0", "MSXML2.DOMDocument.4.0",
                             "MSXML2.DOMDocument.3.0", "MSXML2.DOMDocument",
                             "Microsoft.XmlDom"];

        for (var i=0; i < arrSignatures.length; i++) {
            try {

                var oXmlDom = new ActiveXObject(arrSignatures[i]);

                return oXmlDom;

            } catch (oError) {
                //ignore
            }
        }                  throw new Error("MSXML is not installed on your system.");

    //同上
    } else if (document.implementation && document.implementation.createDocument) {

        var oXmlDom = document.implementation.createDocument("","",null);        //创建Mozilla版本的parseError对象
        oXmlDom.parseError = {
            valueOf: function () { return this.errorCode; },
            toString: function () { return this.errorCode.toString() }
        };

        //初始化parseError对象
        oXmlDom.__initError__();


        oXmlDom.addEventListener("load", function () {
            this.__checkForErrors__();
            this.__changeReadyState__(4);
        }, false);        return oXmlDom;

    } else {
        throw new Error("Your browser doesn't support an XML DOM object.");
    }
}//此处用到了该书中一个浏览器系统检测js文件，如果是Mozilla
if (document.addEventListener) {    Document.prototype.readyState = 0;
    Document.prototype.onreadystatechange = null;
    Document.prototype.__changeReadyState__ = function (iReadyState) {
        this.readyState = iReadyState;        if (typeof this.onreadystatechange == "function") {
            this.onreadystatechange();
        }
    };
    //初始化parseError对象
    Document.prototype.__initError__ = function () {
        this.parseError.errorCode = 0;
        this.parseError.filepos = -1;
        this.parseError.line = -1;
        this.parseError.linepos = -1;
        this.parseError.reason = null;
        this.parseError.srcText = null;
        this.parseError.url = null;
    };

    Document.prototype.__checkForErrors__ = function () {        if (this.documentElement.tagName == "parsererror") {            var reError = />([\s\S]*?)Location:([\s\S]*?)Line Number (\d+), Column (\d+):<sourcetext>([\s\S]*?)(?:\-*\^)/;            reError.test(this.xml);

            this.parseError.errorCode = -999999;
            this.parseError.reason = RegExp.$1;
            this.parseError.url = RegExp.$2;
            this.parseError.line = parseInt(RegExp.$3);
            this.parseError.linepos = parseInt(RegExp.$4);
            this.parseError.srcText = RegExp.$5;
        }
    };

     //定义Mozilla的loadXML方法
    Document.prototype.loadXML = function (sXml) {

        this.__initError__();

        this.__changeReadyState__(1);

        var oParser = new DOMParser();
        var oXmlDom = oParser.parseFromString(sXml, "text/xml");

        while (this.firstChild) {
            this.removeChild(this.firstChild);
        }        for (var i=0; i < oXmlDom.childNodes.length; i++) {
            var oNewNode = this.importNode(oXmlDom.childNodes[i], true);
            this.appendChild(oNewNode);
        }

        //载入后检查错误
        this.__checkForErrors__();

        //没有问题，设置readyState属性为4
        this.__changeReadyState__(4);    };

    Document.prototype.__load__ = Document.prototype.load;    Document.prototype.load = function (sURL) {
        this.__initError__();
        this.__changeReadyState__(1);
        this.__load__(sURL);
    };

    Node.prototype.__defineGetter__("xml", function () {
        var oSerializer = new XMLSerializer();
        return oSerializer.serializeToString(this, "text/xml");
    });}    var oXmlDom = new XmlDom();
    oXmlDom.onreadystatechange = function()
    {
        if(oXmlDom.readyState == 4)
        {
            if(oXmlDom.parseError != 0)
            {
                var oError = oXmlDom.parseError;
                alert("An error occurred:\nError Code:" + oError.errorCode + "\n" + "Line: " + oError.line + "\n" + "reason: " + oError.reason);
            }
            else
            {
                alert(oXmlDom.xml + "\n为什么啊?");
            }
        }
    }
    oXmlDom.load("test.xml");
</script>
    </head>
    <body>
    </body>
</html>

调试一下吧，看看引用的是哪个对象，是什么生成的对象oXmlDom.loadXML("test.xml");看看有没有相关dom对象，或输出一下该对象的内容看看

唉,还是找不到自己哪里错了?各位有用firefox浏览器的吗/帮忙测试一下好吗?

没听明白,说的什么意思
不过我测试了此代码,在__initError__加了一个alert(0)
被调用一次.你的一次没调用,是不是你没刷新缓存啊

少点东西
这里
if(document.implementation && document.implementation.createDocument)//初始化Mozilla信息
{

//后加的
if (typeof XMLDocument != "undefined") {
Document = XMLDocument;
} else if (typeof Document != "undefined") {
Document = Document;
}
...

谢谢,不了知道为什么又好了,再问一下,下面的代码中的alert(1)什么时候会执行啊?<html>
    <head>
        <title>Test</title>
<script language = "javascript" >
    function XmlDom()
    {
        if(window.ActiveXObject)
        {
            var arrSignatures = ["MSXML2.DOMDocument.5.0","MSXML2.DOMDocument.4.0","MSXML2.DOMDocument.3.0","MSXML2.DOMDocument","Microsoft.XmlDom"];
            for(var i=0; i<arrSignatures.length; i++)
            {
                try
                {
                    var oXmlDom = new ActiveXObject(arrSignatures[i]);//创建IE中的oXmlDom实例
                    return oXmlDom;
                }
                catch(exception)
                {
                    //ignore
                }
            }
            throw new Error("Your browser doesn't support an XML DOM object!!!!!");
        }
        else if(document.implementation && document.implementation.createDocument)
        {
            var oXmlDom = document.implementation.createDocument("","",null);//创建Mozilla中的oXmlDom实例
            oXmlDom.parseError =
            {
                valueOf:function(){return this.errorCode},
                toString:function(){return this.errorCode.toString()}
            };
            oXmlDom.__initError__();
            oXmlDom.addEventListener("load",function()
            {
                this.__checkForErrors__();
this.__changeReadyState__(4);
            },false);
            return oXmlDom;
        }
        else
        {
            throw new Error("Your browser doesn't support an XML DOM object!!!!!");
        }
    }
    if(document.implementation && document.implementation.createDocument)//初始化Mozilla信息
    {
        Document.prototype.readState = 0;//创建加载状态特性
        Document.prototype.onreadystatechange = null;//创建加载事件
        Document.prototype.__changeReadyState__ = function(iReadyState)//加载事件函数
        {
            this.readyState = iReadyState;
            if(typeof this.onreadystatechange == "function")
            {
                this.onreadystatechange();
            }
        }
        Document.prototype.__initError__ = function()//初始化Mozilla的错误信息
        {
            this.parseError.errorCode = 0;
            this.parseError.filepos = -1;
            this.parseError.line = -1;
            this.parseError.linepos =-1;
            this.parseError.reason = null;
            this.parseError.srcText = null;
            this.parseError.url = null;
        }
        Document.prototype.__checkForErrors__ = function()//检查错误信息
        {
            if(this.documentElement.tagName == "parsererror")
            {
                var reError = />[\s\S]*?>([\s\S]*?)位置[\s\S]*?([\s\S]*?)行[\s\S]*?(\d+)[\s\S]*?列[\s\S]*?(\d+)[\s\S]*?<sourcetext>([\s\S]*?)<\/sourcetext>/;
                reError.test(this.xml);
                this.parseError.errorCode = -999999;
                this.parseError.reason = RegExp.$1;
                this.parseError.url = RegExp.$2;
                this.parseError.line = parseInt(RegExp.$3);
                this.parseError.linepos = parseInt(RegExp.$4);
                this.parseError.srcText = RegExp.$5;

            }
        }
        Document.prototype.loadXML = function(sXml)//添加loadXML方法,以便和IE实现一样
        {
            this.__initError__();
            this.__changeReadyState__(1);
            var oParser = new DOMParser();
            var oXmlDom = oParser.parseFromString(sXml,"text/xml");
            while(this.firstChild)
            {
                this.removeChild(this.firstChild);
            }
            for(var i=0; i<oXmlDom.childNodes.length; i++)
            {
                var oNewNode = this.importNode(oXmlDom.childNodes[i],true);
                this.appendChild(oNewNode);
            }
            this.__checkForErrors__();
            this.__changeReadyState__(4);
        }
        Document.prototype.__load__ = Document.prototype.load;//更新Mozilla的load信息
        Document.prototype.load = function(sRUL)//更新Mozilla的load信息
        {
            alert(1);
this.__initError__();
            this.__changeReadyState__(1);
            this.__load__(sRUL);
        }
        Node.prototype.__defineGetter__("xml",function()//为每个节点添加xml特性,以便和IE实现一样
        {
            var oSerializer = new XMLSerializer();
            return oSerializer.serializeToString(this,"text/xml");
        });
    }
    var oXmlDom = new XmlDom();
    oXmlDom.onreadystatechange = function()
    {
        if(oXmlDom.readyState == 4)
        {
            if(oXmlDom.parseError != 0)
            {
                var oError = oXmlDom.parseError;
                alert("An error occurred:\nError Code:" + oError.errorCode + "\n" + "Line: " + oError.line + "\n" + "reason: " + oError.reason);
            }
        }
    }
    oXmlDom.load("test.xml");
</script>
    </head>
    <body>
    </body>
</html>

Document.prototype.load = function (sURL) {
alert(sURL);

你并没有load()方法,你可以用alert输出看看就知道了//oXmlDom.load("test.xml");
alert(oXmlDom.load);
将输出
function load(){
[native code]
}

楼上的朋友,我已经重新定义了load方法了啊?:
Document.prototype.__load__ = Document.prototype.load;//更新Mozilla的load信息
Document.prototype.load = function(sRUL)//更新Mozilla的load信息
{
this.__initError__();
this.__changeReadyState__(1);
this.__load__(sRUL);
}
你怎么说我没有定义load方法啊?我还是不太明白你的意思,请指教.

不是说了吗, 加段话,然后用 ff浏览器打开
if(document.implementation && document.implementation.createDocument)//初始化Mozilla信息
{
//在这里加上下面这段话就行了
if (typeof XMLDocument != "undefined") {
Document = XMLDocument;
} else if (typeof Document != "undefined") {
Document = Document;
}...

Sorry,写错了,是你没有重写load方法

?
IE哪有DOM HTML API ？

那程序当中:
       Document.prototype.__load__ = Document.prototype.load;//更新
    Document.prototype.load = function(sRUL)//更新Mozilla的load信息
    {
        this.__initError__();
        this.__changeReadyState__(1);
        this.__load__(sRUL);
    }
这段话就没有作用了,如果前面没有用如下的代码:
   //在这里加上下面这段话就行了
    if (typeof XMLDocument != "undefined") {
        Document = XMLDocument;
    } else if (typeof Document != "undefined") {
        Document = Document;
    }

调试易

100分求人看一个<javascript高级程序设计>>书的上错误!!!!!

解决方案 »