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XML学习(二)详解DOM操作XML文档

黄舟
发布: 2017-03-20 16:56:09
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在DOM眼中,HTML跟XML一样是一种树形结构的文档。各个节点被视为各种类型的Node对象。每个Node对象都有自己的属性和方法,利用这些属性和方法可以遍历整个文档树。DOM定义了nodeType来表示节点的类型

接口

nodeType常量

nodeType值

备注

Element

Node.ELEMENT_NODE

1

元素节点

Text

Node.TEXT_NODE

3

文本节点

Document

Node.DOCUMENT_NODE

9

document

Comment

Node.COMMENT_NODE

8

注释的文本

DocumentFragment

Node.DOCUMENT_FRAGMENT_NODE

11

document片断

Attr

Node.ATTRIBUTE_NODE

2

节点属性

DOM树的根节点是个Document对象,有时候document即指向整个文档。

Document定义的方法大多数是生产型方法,主要用于创建可以插入文档中的各种类型的节点。常用的Document方法有:

方法

描述

createAttribute()

用指定的名字创建新的Attr节点。

createComment()

用指定的字符串创建新的Comment节点。

createElement()

用指定的标记名创建新的Element节点。

createTextNode()

用指定的文本创建新的TextNode节点。

getElementById()

返回文档中具有指定id属性的Element节点。

getElementsByTagName()

返回文档中具有指定标记名的所有Element节点。

 Element常用的方法:

方法

描述

getAttribute()

以字符串形式返回指定属性的值。

getAttributeNode()

以Attr节点的形式返回指定属性的值。

getElementsByTabName()

返回一个Node数组,包含具有指定标记名的所有Element节点的子孙节点,其顺序为在文档中出现的顺序。

hasAttribute()

如果该元素具有指定名字的属性,则返回true。

removeAttribute()

从元素中删除指定的属性。

removeAttributeNode()

从元素的属性列表中删除指定的Attr节点。

setAttribute()

把指定的属性设置为指定的字符串值,如果该属性不存在则添加一个新属性。

setAttributeNode()

把指定的Attr节点添加到该元素的属性列表中。

 Node对象常用属性:

属性

描述

attributes

如果该节点是一个Element,则以NamedNodeMap形式返回该元素的属性。

childNodes

以Node[]的形式存放当前节点的子节点。如果没有子节点,则返回空数组。

firstChild

以Node的形式返回当前节点的第一个子节点。如果没有子节点,则为null

lastChild

以Node的形式返回当前节点的最后一个子节点。如果没有子节点,则为null。

nextSibling

以Node的形式返回当前节点的兄弟下一个节点。如果没有这样的节点,则返回null。

nodeName

节点的名字,Element节点则代表Element的标记名称。

nodeType

代表节点的类型。

parentNode

以Node的形式返回当前节点的父节点。如果没有父节点,则为null。

previousSibling

以Node的形式返回紧挨当前节点、位于它之前的兄弟节点。如果没有这样的节点,则返回null。

Node对象常用方法:

方法

描述

appendChild()

通过把一个节点增加到当前节点的childNodes[]组,给文档树增加节点。

cloneNode()

复制当前节点,或者复制当前节点以及它的所有子孙节点。

hasChildNodes()

如果当前节点拥有子节点,则将返回true。

insertBefore()

给文档树插入一个节点,位置在当前节点的指定子节点之前。如果该节点已经存在,则删除之再插入到它的位置。

removeChild()

从文档树中删除并返回指定的子节点。

replaceChild()

从文档树中删除并返回指定的子节点,用另一个节点替换它。


获取元素的值

下面的代码检索第一个 元素的文本值:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">x=xmlDoc.getElementsByTagName("title")[0].childNodes[0];txt=x.nodeValue; //其实应该先判断节点是否存在</pre><div class="contentsignin">登录后复制</div></div><p>结果:txt = "Harry Potter"</p><h2>获取属性的值</h2><p>下面的代码检索第一个 <title> 元素的 "<a href="http://www.php.cn/java/java-ymp-Lang.html" target="_blank">lang</a>" 属性的文本值:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">txt=xmlDoc.getElementsByTagName("title")[0].getAttribute("lang");</pre><div class="contentsignin">登录后复制</div></div><p>结果:txt = "en"</p><h2>改变元素的值</h2><p>下面的代码改变第一个 <title> 元素的文本值:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">x=xmlDoc.getElementsByTagName("title")[0].childNodes[0];x.nodeValue="Easy Cooking";</pre><div class="contentsignin">登录后复制</div></div><h2>改变属性的值</h2><p>setAttribute() 方法可用于改变已有属性的值,或创建一个新属性。</p><p>下面的代码向每个 <book> 元素添加了名为 "edition" 的新属性(值是 "first"):</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">x=xmlDoc.getElementsByTagName("book");for(i=0;i<x.length;i++) { x[i].setAttribute("edition","first"); }</pre><div class="contentsignin">登录后复制</div></div><h2>创建元素</h2><p>createElement() 方法创建新的元素节点。</p><p>createTextNode() 方法创建新的文本节点。</p><p>appendChild() 方法向节点添加子节点(在最后一个子节点之后)。</p><p>如需创建带有文本内容的新元素,需要同时创建元素节点和文本节点。</p><p>下面的代码创建了一个元素 (<edition>),然后把它添加到第一个 <book> 元素中:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">newel=xmlDoc.createElement("edition");</pre><div class="contentsignin">登录后复制</div></div><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">newtext=xmlDoc.createTextNode("First");</pre><div class="contentsignin">登录后复制</div></div><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">newel.appendChild(newtext);</pre><div class="contentsignin">登录后复制</div></div><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">x=xmlDoc.getElementsByTagName("book");x[0].appendChild(newel);</pre><div class="contentsignin">登录后复制</div></div><h3>例子解释:</h3><ol class=" list-paddingleft-2"><li><p>创建 <edition> 元素</p></li><li><p>创建值为 "First" 的文本节点</p></li><li><p>把这个文本节点追加到 <edition> 元素</p></li><li><p>把 <edition> 元素追加到第一个 <book> 元素</p></li></ol><h2>删除元素</h2><p>removeChild() 方法删除指定的节点(或元素)。</p><p>下面的代码片段将删除第一个 <book> 元素中的第一个节点:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;">x=xmlDoc.getElementsByTagName("book")[0];x.removeChild(x.childNodes[0]);</pre><div class="contentsignin">登录后复制</div></div><h2>实例代码</h2><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:xml;toolbar:false;"><p><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><span style="color: #0000ff;"><</span><span style="color: #800000;">html </span><span style="color: #ff0000;">xmlns</span><span style="color: #0000ff;">="http://www.w3.org/1999/xhtml"</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">head </span><span style="color: #ff0000;">runat</span><span style="color: #0000ff;">="server"</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">script </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/<a href="http://www.php.cn/wiki/48.html" target="_blank">javascript</a>"</span><span style="color: #0000ff;">></span><span style="background-color: #f5f5f5; color: #000000;"><br/></span><span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;"> parseXML() {<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">try</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">Internet Explorer</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> {<br/> xmlDoc </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">new</span><span style="background-color: #f5f5f5; color: #000000;"> ActiveX<a href="http://www.php.cn/wiki/60.html" target="_blank">Object</a>(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">Microsoft.XMLDOM</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> }<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">catch</span><span style="background-color: #f5f5f5; color: #000000;"> (e) { <br/></span><span style="background-color: #f5f5f5; color: #0000ff;">try</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">Firefox, Mozilla, Opera, etc.</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> {<br/> xmlDoc </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> document.implementation.createDocument(</span><span style="background-color: #f5f5f5; color: #000000;">""</span><span style="background-color: #f5f5f5; color: #000000;">, </span><span style="background-color: #f5f5f5; color: #000000;">""</span><span style="background-color: #f5f5f5; color: #000000;">, </span><span style="background-color: #f5f5f5; color: #0000ff;">null</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> }<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">catch</span><span style="background-color: #f5f5f5; color: #000000;"> (e) {<br/> alert(e.message);<br/></span><span style="background-color: #f5f5f5; color: #0000ff;"><a href="http://www.php.cn/wiki/135.html" target="_blank">return</a></span><span style="background-color: #f5f5f5; color: #000000;">;<br/> }<br/> }<br/> xmlDoc.async </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">; </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">假如xml载入完毕执行以下</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> xmlDoc.load(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">note.xml</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> x </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> xmlDoc.getElementsByTagName(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">to</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/></span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> xmlDoc.getElementsByTagName("to")[0].setAttribute("<a href="http://www.php.cn/wiki/1255.html" target="_blank">date</a>") = "1515"; //设置属性值</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> xmlDoc.getElementsByTagName("to")[0].childNodes[0].nodeValue = "tiewang"; //设置文本节点值</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> <br/></span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> //<a href="http://www.php.cn/code/6276.html" target="_blank">循环</a>修改</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> for (i = 0; i < x.length; i++) {</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> if (x[i].childNodes[0] == null) { //如果不存在问题,则添加</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> newText1 = xmlDoc.createTextNode("af");</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> x[i].appendChild(newText1);</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> }</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> x[i].childNodes[0].nodeValue = "af";</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> }</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> //循环添加 //注意,如果把create放在<a href="http://www.php.cn/code/5913.html" target="_blank">for循环</a>外面,则只能添加到最后一个,需要放在for里面</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (i </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">; i </span><span style="background-color: #f5f5f5; color: #000000;"><</span><span style="background-color: #f5f5f5; color: #000000;"> x.length; i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (x[i].getElementsByTagName(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">too</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">)[</span><span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">] </span><span style="background-color: #f5f5f5; color: #000000;">==</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">null</span><span style="background-color: #f5f5f5; color: #000000;">) {<br/> newElemenet </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> xmlDoc.createElement(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">too</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> newText </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> xmlDoc.createTextNode(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">logo</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> newElemenet.setAttribute(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">id</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">, </span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">1</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> newElemenet.appendChild(newText); <br/> x[i].appendChild(newElemenet);<br/> }<br/> }<br/></span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> //循环删除</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> for (i = 0; i < x.length; i++) {</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> if (x[i].getElementsByTagName("too")[0] != null) {</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> x[i].removeChild(x[i].getElementsByTagName("too")[0]);</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> }</span><span style="background-color: #f5f5f5; color: #008000;"><br/>//</span><span style="background-color: #f5f5f5; color: #008000;"> }</span></p><p><span style="background-color: #f5f5f5; color: #008000;"> </span><span style="background-color: #f5f5f5; color: #008000;">    <br/></span><span style="background-color: #f5f5f5; color: #000000;"> <span style="font-family: Courier New; background-color: #f5f5f5;"> </span></span></p><p><span style="background-color: #f5f5f5; color: #000000;"><span style="font-family: Courier New; background-color: #f5f5f5;">      //删除to -> too 节点中的ID属性<br/> for (i = 0; i < x.length; i++) {<br/> if (x[i].getElementsByTagName("too")[0] != null) {<br/> if (x[i].getElementsByTagName("too")[0].getAttribute("id")!=null) {<br/> x[i].getElementsByTagName("too")[0].removeAttribute("id");<br/> }<br/> }<br/> }</span><br/></span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> xmlHttp;<br/><br/></span><span style="background-color: #f5f5f5; color: #0000ff;">try</span><span style="background-color: #f5f5f5; color: #000000;"> {<br/></span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> Firefox, Opera 8.0+, Safari</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> xmlHttp </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">new</span><span style="background-color: #f5f5f5; color: #000000;"> XMLHttpRequest();<br/> }<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">catch</span><span style="background-color: #f5f5f5; color: #000000;"> (e) {<br/><br/></span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> Internet Explorer</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">try</span><span style="background-color: #f5f5f5; color: #000000;"> {<br/> xmlHttp </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">new</span><span style="background-color: #f5f5f5; color: #000000;"> ActiveXObject(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">Msxml2.XMLHTTP</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> }<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">catch</span><span style="background-color: #f5f5f5; color: #000000;"> (e) {<br/><br/></span><span style="background-color: #f5f5f5; color: #0000ff;">try</span><span style="background-color: #f5f5f5; color: #000000;"> {<br/> xmlHttp </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">new</span><span style="background-color: #f5f5f5; color: #000000;"> ActiveXObject(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">Microsoft.XMLHTTP</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/> }<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">catch</span><span style="background-color: #f5f5f5; color: #000000;"> (e) {<br/> alert(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">您的浏览器不支持AJAX!</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);<br/></span><span style="background-color: #f5f5f5; color: #0000ff;">return</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">;<br/> }<br/> }<br/> }<br/> xmlHttp.onreadystatechange </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;">() { </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">onreadystatechange 属性存有处理服务器响应的<a href="http://www.php.cn/wiki/145.html" target="_blank">函数</a></span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (xmlHttp.readyState </span><span style="background-color: #f5f5f5; color: #000000;">==</span><span style="background-color: #f5f5f5; color: #000000;"> </span><span style="background-color: #f5f5f5; color: #000000;">4</span><span style="background-color: #f5f5f5; color: #000000;">) { </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">readyState 属性存有服务器响应的<a href="http://www.php.cn/code/8243.html" target="_blank">状态</a>信息</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> document.getElementById(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">to</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">).innerHTML </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> xmlHttp.responseText; </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">通过 responseText 属性来取回由服务器返回的数据</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> }<br/> }<br/> xmlHttp.open(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">POST</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">, </span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">receive.<a href="http://www.php.cn/wiki/1519.html" target="_blank">asp</a>x?type=xmlsave</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">, </span><span style="background-color: #f5f5f5; color: #0000ff;">true</span><span style="background-color: #f5f5f5; color: #000000;">); <br/><br/></span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> open() 方法需要三个参数。第一个参数定义发送请求所使用的方法(GET 还是 POST)。第二个参数规定服务器端脚本的 URL。第三个参数规定应当对请求进行异步地处理。</span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> xmlHttp.send(xmlDoc); </span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">send() 方法可将请求送往服务器 </span><span style="background-color: #f5f5f5; color: #008000;"><br/></span><span style="background-color: #f5f5f5; color: #000000;"> }<br/></span><span style="color: #0000ff;"></</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"></</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">body </span><span style="color: #ff0000;"><a href="http://www.php.cn/wiki/1467.html" target="_blank">onload</a></span><span style="color: #0000ff;">="parseXML()"</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">form </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="form1"</span><span style="color: #ff0000;"> runat</span><span style="color: #0000ff;">="server"</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">h1 </span><span style="color: #ff0000;">id </span><span style="color: #0000ff;">= "to"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"><</span><span style="color: #800000;">h1 </span><span style="color: #ff0000;">id </span><span style="color: #0000ff;">="value"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/><br/><br/></span><span style="color: #0000ff;"></</span><span style="color: #800000;">p</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"></</span><span style="color: #800000;">form</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"></</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span><span style="color: #000000;"><br/></span><span style="color: #0000ff;"></</span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></p></pre><div class="contentsignin">登录后复制</div></div><p> </p><p>以上是XML学习(二)详解DOM操作XML文档的详细内容。更多信息请关注PHP中文网其他相关文章!</p> </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>相关标签:</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/zh/search?word=xml,dom" target="_blank">XML,DOM</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">来源:php.cn</div> </div> <div class="wzconOtherwz"> <a href="https://www.php.cn/zh/faq/357724.html" title="XML学习(一)元素,属性,读取详解"> 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