uTools-Manuals/docs/java/org/w3c/dom/DocumentFragment.html

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<h2 class="title" title="Interface DocumentFragment">Interface DocumentFragment</h2>
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         All Superinterfaces: 
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<span><a href="../../../org/w3c/dom/Node.html" title="界面在org.w3c.dom">Node</a></span>
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<hr/> <br/> <pre>public interface <span class="typeNameLabel">DocumentFragment</span>
extends <a href="../../../org/w3c/dom/Node.html" title="interface in org.w3c.dom">Node</a></pre>
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<span><code>DocumentFragment</code>是一个“轻量级”或“最小” <code>Document</code>对象。</span>
<span>希望能够提取文档树的一部分或创建文档的新片段是非常常见的。</span>
<span>想象一下，通过移动片段来实现用户命令，如剪切或重排文档。</span>
<span>期望具有可以容纳这样的片段的对象，并且为此目的使用节点是很自然的。</span>
<span><code>Document</code>对象确实可以实现此角色， <code>Document</code>对象可能是重量级对象，具体取决于底层实现。</span>
<span>真正需要的是一个非常轻量级的对象。</span>
<span><code>DocumentFragment</code>是这样的对象。</span>
<p> <span>此外，各种操作 - 例如将节点作为另一个<code>Node</code>子节点<code>Node</code> - 可能需要<code>DocumentFragment</code>对象作为参数;</span> <span>这导致<code>DocumentFragment</code>所有子节点被移动到该节点的子列表。</span> </p>
<p> <span><code>DocumentFragment</code>节点的<code>DocumentFragment</code>节点是表示定义文档结构的任何子树的顶部的零个或多个节点。</span> <span><code>DocumentFragment</code>节点不需要格式良好的XML文档（尽管他们确实需要遵循强大的格式好的XML解析实体的规则，可以有多个顶级节点）。</span> <span>例如， <code>DocumentFragment</code>可能只有一个子节点，该子节点可能是<code>Text</code>节点。</span> <span>这样的结构模型既不表示HTML文档也不表示格式良好的XML文档。</span> </p>
<p> <span>当<code>DocumentFragment</code>插入到<code>Document</code> （或任何其他<code>Node</code> ，可能需要子女）的子女<code>DocumentFragment</code> ，而不是<code>DocumentFragment</code>自身插入到<code>Node</code> 。</span> <span>这使得<code>DocumentFragment</code>非常有用，当用户希望创建的节点是兄弟姐妹;</span> <span><code>DocumentFragment</code>充当这些节点的父节点，以便用户可以使用<code>Node</code>接口的标准方法，如<code>Node.insertBefore</code>和<code>Node.appendChild</code> 。</span> </p>
<p> <span>另见<a href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407">Document Object Model (DOM) Level 3 Core Specification</a> 。</span> </p>
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