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tutorial of DHTML and javascript programming<\/div> \r\n <\/body> <\/html> 我們參照樹的概念，畫出該HTML文檔結(jié)構(gòu)的DOM樹： \r\n html body head \r\n div title 文本文本從上面的圖示可以看出 \r\nhtml有兩個子結(jié)點，而html就是這兩個子節(jié)點的父結(jié)點 head有節(jié)點title，title下有一個文本節(jié)點 \r\ndoby下有節(jié)點div，div下有一個文本節(jié)點三、操作DOM樹 \r\n開篇已經(jīng)說過，DHTML本質(zhì)就是操作DOM樹。如何操作它呢？假設(shè)我要改變上面HTML文檔中div結(jié)點的文本，如何做? \r\n 程序代碼 \r\n never-online's website<\/title> <br\/> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body data-commit-time="2023-12-28T14:50:12+08:00" class="editor_body body2_2"> <h1><a href="http://m.miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1> <link rel="stylesheet" type="text/css" href="/static/csshw/stylehw.css"> <header> <div id="377j5v51b" class="head"> <div id="377j5v51b" class="haed_left"> <div id="377j5v51b" 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class="phpgenera_Details_mainL1a">Home</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://m.miracleart.cn/web-designer.html" class="phpgenera_Details_mainL1a">Web Front-end</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://m.miracleart.cn/js-tutorial.html" class="phpgenera_Details_mainL1a">JS Tutorial</a> <img src="/static/imghw/top_right.png" alt="" /> <span>Javascript & DHTML DOM Basics and Basic API Page 1/5_javascript skills</span> </div> <div id="377j5v51b" class="Articlelist_txts"> <div id="377j5v51b" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">Javascript & DHTML DOM Basics and Basic API Page 1/5_javascript skills</h1> <div id="377j5v51b" class="Articlelist_txts_info_head"> <div id="377j5v51b" class="author_info"> <a href="http://m.miracleart.cn/member/1.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/001/6251028808086368.png" src="/static/imghw/default1.png" alt="PHP中文網(wǎng)"> </a> <div id="377j5v51b" class="author_detail"> <a href="http://m.miracleart.cn/member/1.html" class="author_name">PHP中文網(wǎng)</a> </div> </div> </div> <span id="377j5v51b" class="Articlelist_txts_time">May 16, 2016 pm 07:03 PM</span> <div id="377j5v51b" class="Articlelist_txts_infos"> <span id="377j5v51b" class="Articlelist_txts_infoss on">api</span> <span id="377j5v51b" class="Articlelist_txts_infoss ">dhtml</span> <span id="377j5v51b" class="Articlelist_txts_infoss ">dom</span> <span id="377j5v51b" class="Articlelist_txts_infoss ">javascript</span> </div> </div> </div> <hr /> <div id="377j5v51b" class="article_main php-article"> <div id="377j5v51b" class="article-list-left detail-content-wrap content"> <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3461856641"> </ins> <p>一、什么是DOM？ <br>什么叫DOM，DOM是文檔對象模型(Document?Object?Model，是基于瀏覽器編程（在本教程中，可以說就是DHTML編程）的一套API接口，W3C出臺的推薦標準，每個瀏覽器都有一些細微的差別，其中以Mozilla的瀏覽器最與標準接近。單純的Javascript要結(jié)合DOM才能做DHTML編程，才能做出漂亮的效果、應(yīng)用于WEB。這點幾乎與其它的語言無異，正如C/C++需要庫支持是一樣的道理。否則就是單純的在語法上做研究了。因此，必須要對DOM有一定的認識，才能把Javascript應(yīng)用于WEB，或你的RIA應(yīng)用當中，因為DHTML本質(zhì)上就是操作DOM樹。 <br>以后的編程當中，希望你能夠把DHTML.chm這本手冊也拿上，如果你需要兼容gecko，把gecko的DOM手冊也帶上。因為API太多，想不起來的接口還可以查這本手冊。 <br><br>如果你要測試瀏覽器是否是支持DOM的，簡單的一句就可以判斷</p><pre class='brush:php;toolbar:false;'><script> var isSupportDOM = !!document.getElementById; //兩個取反，這已經(jīng)在上節(jié)中說過了，意思是強制轉(zhuǎn)型 alert("你的瀏覽器 " +(isSupportDOM?"":"不")+ "支持 DOM！"); </script></pre><p> 二、DOM樹 <br/>要注意：DOM樹的根統(tǒng)一為文檔根—document，DOM既然是樹狀結(jié)構(gòu)，那么他們自然有如下的幾種關(guān)系: <br/><br/>根結(jié)點(document) <br/><br/> 父結(jié)點(parentNode) <br/><br/> 子結(jié)點(childNodes) <br/><br/> 兄弟結(jié)點兄弟結(jié)點 <br/> (sibling) (sibling) <br/><br/>例子： <br/><br/>假設(shè)網(wǎng)頁的HTML如下 <br/><br/> 程序代碼 <br/><br/><html> <br/> <head> <br/> <title>never-online's website

tutorial of DHTML and javascript programming

我們參照樹的概念，畫出該HTML文檔結(jié)構(gòu)的DOM樹：

html

body head

div title

文本文本

從上面的圖示可以看出
html有兩個子結(jié)點，而html就是這兩個子節(jié)點的父結(jié)點

head有節(jié)點title，title下有一個文本節(jié)點

doby下有節(jié)點div，div下有一個文本節(jié)點

三、操作DOM樹
開篇已經(jīng)說過，DHTML本質(zhì)就是操作DOM樹。如何操作它呢？
假設(shè)我要改變上面HTML文檔中div結(jié)點的文本，如何做?

程序代碼

never-online's website
<script> <br/> function changedivText (strText) { <br/> var nodeRoot = document; //這個是根結(jié)點 <br/> var nodeHTML = nodeRoot.childNodes[0]; //這個是html結(jié)點 <br/> var nodeBody = nodeHTML.childNodes[1]; //body結(jié)點 <br/> var nodeDiv = nodeBody.childNodes[0]; //DIV結(jié)點 <br/> var nodeText = nodeDiv.childNodes[0];//文本結(jié)點' <br/> nodeText.data = strText; //文本節(jié)點有data這個屬性，因此我們可以改變這個屬性，也就成功的操作了DOM樹中的一個結(jié)點了 <br/> } <br/> </script>

tutorial of DHTML and javascript programming

從上面的示例可以看出，我們可以用上面的這種方法操作DOM樹上的任一節(jié)點。（注：1. 跨域除外，跨域通常是在操作frame上，簡單的說，就是兩個frame不屬于同一域名。2.上面的操作為了演示，采用的方法是從根結(jié)點一直到文本結(jié)點的遍歷，在DOM方法上，有更簡潔的方法，這些以后會有更多示例加以說明，下文中也會有介紹）

三、DOM節(jié)點。
細心些的朋友也許發(fā)現(xiàn)了，在上面寫的HTML代碼時用<>與包函起來的就是一個結(jié)點，事實上是這樣的嗎？答案是否定的。下面就是說說節(jié)點類型，否則在有的時候是會犯錯誤的。比如，你把上面的代碼放到Mozilla firefox的瀏覽器里運行一下，就會知道了。
DOM中的結(jié)點類型比較多，這里寫一些在HTML文檔中（注：XML也是DOM樹結(jié)構(gòu)）常見的幾種結(jié)點類型。

1、DOCUMENT_NODE
（document）文檔根結(jié)點類型，該枚舉型的值是9.

2、ELEMENT_NODE
（element）元素結(jié)點類型，該枚舉型的值是1。上文中的html, body, div這些結(jié)點都是屬于該類型。

3、TEXT_NODE
（text）文本結(jié)點類型，該枚舉型的值是3。上文中的文本，如：tutorial of DHTML and javascript programming就是屬于該類型。
（注：一個空格也就可能是一個文本結(jié)點）

通常更需要注意的是文本結(jié)點，有可能一個回車，一個空格都是文本結(jié)點。這一點以后會碰到，當然，我們也有辦法處理，這里先不要急，以后也會說到的。

四、DOM常用的API

這些常用的API是要記下來的，當然在非IE的瀏覽器里也會有效，是符合w3c的。這些API在以后的編程中會常常用到。正如每個編程平臺所提供的API一樣，常用必須記下來，節(jié)省時間從而提高編程效率。只寫幾個最常用的，其它的API會在以后的示例中寫出。由淺而深，從易到難嘛。

1、獲取ELEMENT_NODE，元素節(jié)點
1)、方法：document.getElementById(元素的Id)，返回值為元素的節(jié)點引用?？梢约傧胍幌逻@個API的原理：象我們上面所做的是遍歷每個節(jié)點（從根到我們所需結(jié)點），這個API，也可以想成是從根遍歷，查詢每個結(jié)點（空白結(jié)點和空結(jié)點除外），并獲取該結(jié)點的id是否為指定的ID，如果是的話，就返回這個結(jié)點（注：在JS中，數(shù)組和對象是引用類型），如果沒有就返回空。我們可以寫寫這個代碼，幫助我們理解document.getElementById。下面是一個簡單遍歷BODY中元素的示例。

<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function myGetElementById (id) { 
      var nodeRoot = document; //這個是根結(jié)點 
      var nodeHTML = nodeRoot.childNodes[0]; //這個是html結(jié)點 
      var nodeBody = nodeHTML.childNodes[1]; //body結(jié)點 
      var bodyChild = nodeBody.childNodes; //body的孩子 
      for (var i=0; i<bodyChild.length; i++) { //簡單的遍歷（指body的孩子下的深度為1) 
        if (bodyChild[i].id==id) return bodyChild[i]; 
      }; 
      return null; 
    } 
    function TestGetElementById (id) { 
      var node = myGetElementById(id); 
      if (node!=null) { 
        alert("找到結(jié)點 "+id+"!"); 
        alert(node.childNodes[0].data); 
      } else { 
        alert("沒有找到結(jié)點 "+id+"."); 
      } 
    } 
    </script> 
  </head> 
  <body> 
    <div id="aTestNode"></div> 
    <div id="textNode">tutorial of DHTML and javascript programming</div> 
    <input onclick="TestGetElementById(&#39;textNode&#39;)" type="button" value="change"/> 
  </body> 
</html>

2)、屬性：object.innerHTML，返回值：一個節(jié)點內(nèi)的HTML值。該屬性為可寫屬性。它雖然不是獲取結(jié)點，但經(jīng)常與獲取結(jié)點相結(jié)合，所以我把它放在獲取結(jié)點這一類，它的屬性就類似于是純文本節(jié)點屬性中的data。以document.getElementById和object.innerHTML這兩個API為例，我們就可以把上面所寫的代碼簡化一下了，示例如下：

<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function changedivText (strText) { 
      var node = document.getElementById("textNode"); 
      node.innerHTML = strText; 
    } 
    </script> 
  </head> 
  <body> 
    <div id="textNode">tutorial of DHTML and javascript programming</div> 
    <input onclick="changedivText(&#39;change?&#39;)" type="button" value="change"/> 
  </body> 
</html>

3)、方法：object.getElementsByTagName(標簽的名字)，返回一個集合，該集合的把有元素都是有指定標簽的元素。訪問集合里的元素，可以用下標來訪問。語法里的object，是指document（根）或者是一個ELEMENT_NODE。這個的原理示例我就不寫了，可以作為一個作業(yè)，大家可以寫寫。這里寫一些具體應(yīng)用。如上例，我們還可以這樣寫。

<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function changedivText (strText) { 
      var node = document.getElementsByTagName("DIV"); 
      node[0].innerHTML = strText; 
    } 
    </script> 
  </head> 
  <body> 
    <div>tutorial of DHTML and javascript programming</div> 
    <input onclick="changedivText(&#39;change?&#39;)" type="button" value="change"/> 
  </body> 
</html>

再取一個例子，注意，BODY下的結(jié)點深度為2。

<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function changedivText (strText) { 
      var node = document.getElementById("nodeTest"); 
      var myNode = node.getElementsByTagName("DIV"); 
      myNode[0].innerHTML = strText; 
    } 
    </script> 
  </head> 
  <body> 
    <div id="nodeTest"> 
      <div>tutorial of DHTML and javascript programming</div> 
      <input onclick="changedivText(&#39;change?&#39;)" type="button" value="change"/> 
    </div> 
  </body> 
</html>

二、動態(tài)創(chuàng)建與插入結(jié)點

1)、創(chuàng)建結(jié)點對象。document.createElement(tagname)，tagname指的是一個標簽，比如一個DIV，就是document.createElement("DIV")，它返回的是這個結(jié)點的引用。

2)、在body的尾部插入結(jié)點用document.body.appendChild(object)，為了容易理解，下面這個示例，我用了IE專有的屬性object.outerHTML，得到一個該元素的HTML標簽內(nèi)容（包括自身），這樣會更容易看到效果。

<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function insertNode (strText) { 
      alert("插入元素前的body HTML：\n" +document.body.outerHTML); 
      var node = document.createElement("DIV"); 
      node.innerHTML = strText; 
      document.body.appendChild(node); 
      alert("插入元素后的body HTML：\n" +document.body.outerHTML); 
    } 
    </script> 
  </head> 
  <body> 
    <div>tutorial of DHTML and javascript programming</div> 
    <input onclick="insertNode(&#39;change?&#39;)" type="button" value="change"/> 
  </body> 
</html> 
[/htm] 
3)、在元素處插入結(jié)點。object.insertBefore(oNewNode [, oChildNode])，oNewNode為一個我們創(chuàng)建的結(jié)點，oChildNode是可選的，為object下的一個子節(jié)點。同樣的，為了看到效果，我也用了outerHTML。示例 
[html] 
<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function insertNode (strText) { 
      alert("插入元素前的body HTML：\n" +document.body.outerHTML); 
      var node = document.createElement("DIV"); 
      var myNode = document.getElementById("textNode"); 
      node.innerHTML = strText; 
      document.body.insertBefore(node,myNode); 
      alert("插入元素后的body HTML：\n" +document.body.outerHTML); 
    } 
    </script> 
  </head> 
  <body> 
    <div id="textNode">tutorial of DHTML and javascript programming</div> 
    <input onclick="insertNode(&#39;change?&#39;)" type="button" value="change"/> 
  </body> 
</html>

三、移除結(jié)點。
1) object.parentNode.removeChild(oChildNode)，這個就是語法，下面看示例。

<html> 
  <head> 
    <title>never-online&#39;s website</title> 
    <script> 
    function insertNode (strText) { 
      alert("插入元素前的body HTML：\n" +document.body.outerHTML); 
      var node = document.createElement("DIV"); 
      var myNode = document.getElementById("textNode"); 
      node.innerHTML = strText; 
      document.body.insertBefore(node,myNode); 
      alert("插入元素后的body HTML：\n" +document.body.outerHTML); 
    } 
    function removeCreateNode() { 
      alert("移除元素前的body HTML：\n" +document.body.outerHTML); 
      var node = document.getElementById("textNode"); 
      node.parentNode.removeChild(node); 
      alert("移除元素前的body HTML：\n" +document.body.outerHTML); 
    } 
    </script> 
  </head> 
  <body> 
    <div id="textNode">tutorial of DHTML and javascript programming</div> 
    <input onclick="insertNode(&#39;change?&#39;)" type="button" value="insert"/> 
    <input onclick="removeCreateNode()" type="button" value="remove"/> 
  </body> 
</html>

這一節(jié)就先寫到這里，下一節(jié)我們就可以用這幾個簡單的API做許多事情了，幾個API就可以寫出很多效果

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