XML DOM 高級

獲取元素的值

下面的實例中使用的 XML 文件：books.xml。

下面的實例檢索第一個元素的文本值：</p> <p>實例</p> <p>txt=xmlDoc.getElementsByTagName(“title”)[0].childNodes[0].nodeValue;</p> <p><center> </center></p> <p>嘗試一下 ?</p> <p></p> <hr> <p>獲取屬性的值</p> <p>下面的實例檢索第一個 <title> 元素的 “lang” 屬性的文本值：</p> <p>實例</p> <p>txt=xmlDoc.getElementsByTagName(“title”)[0].getAttribute(“lang”);</p> <p>嘗試一下 ?</p> <p></p> <hr> <p>改變元素的值</p> <p>下面的實例改變第一個 <title> 元素的文本值：</p> <p>實例</p> <p>x=xmlDoc.getElementsByTagName(“title”)[0].childNodes[0];</p> <p><center> </center></p> <p>x.nodeValue=”Easy Cooking”;</p> <p>嘗試一下 ?</p> <p></p> <hr> <p>創建新的屬性</p> <p>XML DOM 的 setAttribute() 方法可用於改變現有的屬性值，或創建一個新的屬性。</p> <p>下面的實例創建了一個新的屬性（edition=”first”），然後把它添加到每一個 <book> 元素中：</p> <p>實例</p> <p>x=xmlDoc.getElementsByTagName(“book”);</p> <p>for(i=0;i<x.length;i++)</p> <p>{</p> <p>x[i].setAttribute(“edition”,”first”);</p> <p><center> </center></p> <p>}</p> <p>嘗試一下 ?</p> <p></p> <hr> <p>創建元素</p> <p>XML DOM 的 createElement() 方法創建一個新的元素節點。</p> <p>XML DOM 的 createTextNode() 方法創建一個新的文本節點。</p> <p>XML DOM 的 appendChild() 方法向節點添加子節點（在最後一個子節點之後）。</p> <p>如需創建帶有文本內容的新元素，需要同時創建元一個新的元素節點和一個新的文本節點，然後把他追加到現有的節點。</p> <p>下面的實例創建了一個新的元素（<edition>），帶有如下文本：First，然後把它添加到第一個 <book> 元素：</p> <p>實例</p> <p>newel=xmlDoc.createElement(“edition”);</p> <p><center> </center></p> <p>newtext=xmlDoc.createTextNode(“First”);</p> <p>newel.appendChild(newtext);</p> <p>x=xmlDoc.getElementsByTagName(“book”);</p> <p>x[0].appendChild(newel);</p> <p><img img_width="1280" img_height="852" alt="XML DOM 高級" src="http://i1.wp.com/p3.pstatp.com/large/pgc-image/15241147506382844e90f80"></p> <p>實例解釋</p> <ul class=" list-paddingleft-2" readability="1"> <li readability="-1"> <p>創建一個 <edition> 元素</p> </li> <li readability="-1"> <p>創建值為 “First” 的文本節點</p> </li> <li readability="-1"> <p>把這個文本節點追加到新的 <edition> 元素</p> </li> <li readability="-1"> <p>把 <edition> 元素追加到第一個 <book> 元素</p> <p><center> </center> </li> </ul> <hr> <p>刪除元素</p> <p>下面的實例刪除第一個 <book> 元素的第一個節點：</p> <p>實例</p> <p>x=xmlDoc.getElementsByTagName(“book”)[0];</p> <p>x.removeChild(x.childNodes[0]);</p> <p>嘗試一下 ?</p> <p><strong>注釋：</strong>上面實例的結果可能會根據所用的瀏覽器而不同。Firefox 把新行字元當作空的文本節點，而 Internet Explorer 不是這樣。您可以在我們的 XML DOM 教程中閱讀到更多有關這個問題以及如何避免它的知識。</p> <p><center>喜歡這篇文章嗎？立刻分享出去讓更多人知道吧！<br /><a href="http://www.facebook.com/sharer.php?u=http://www.ifuun.com/a2018042012240054/" target="_blank"><img src="https://pic.pimg.tw/zzuyanan/1488615166-1259157397.png"></a></center><br /><center>本站內容充實豐富，博大精深，小編精選每日熱門資訊，隨時更新，點擊<a target="_blank" href="http://www.ifuun.com/today/">「搶先收到最新資訊」</a>瀏覽吧！</center><br /><center><a href="http://line.naver.jp/R/msg/text/?XML%20DOM%20%E9%AB%98%E7%B4%9A%0D%0Ahttp://www.ifuun.com/a201842012240054/"><img src="https://pic.pimg.tw/zzuyanan/1482887990-2595557020.jpg"></a></center><br /><center><span><i class="fa fa-paper-plane"></i></span> 請您繼續閱讀更多來自 <a class="bdcs-inlinelink" target="_blank" href="http://www.ifuun.com/tag/%E7%A8%8B%E5%BA%8F%E5%93%A1%E5%B0%8F%E6%96%B0%E4%BA%BA%E5%AD%B8%E7%BF%92/"><b>程序員小新人學習</b></a> 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