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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/api/nodeiterator | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/api/nodeiterator/index.html b/files/zh-cn/web/api/nodeiterator/index.html new file mode 100644 index 0000000000..2b2795b6a0 --- /dev/null +++ b/files/zh-cn/web/api/nodeiterator/index.html @@ -0,0 +1,214 @@ +--- +title: NodeIterator +slug: Web/API/NodeIterator +tags: + - API + - DOM +translation_of: Web/API/NodeIterator +--- +<div>{{APIRef("DOM")}}</div> + +<p><strong><code>NodeIterator</code></strong> 接口表示一个遍历 DOM 子树中节点列表的成员的迭代器。节点将按照文档顺序返回。</p> + +<p>NodeIterator可以使用{{domxref("Document.createNodeIterator()")}} 方法创建,如下所示:</p> + +<pre class="brush: js">var nodeIterator = document.createNodeIterator(<em>root</em>, <em>whatToShow</em>, <em>filter</em>);</pre> + +<h2 id="Properties" name="Properties">属性</h2> + +<p><em>这个接口不继承任何属性。</em></p> + +<dl> + <dt>{{domxref("NodeIterator.root")}} {{readonlyInline}}</dt> + <dd>返回一个{{domxref("Node")}} ,它代表创建 NodeIterator 时指定的根节点。</dd> + <dt>{{domxref("NodeIterator.whatToShow")}} {{readonlyInline}}</dt> + <dd>返回一个无符号长整型,它是一个由描述必须呈现的{{domxref("Node")}}类型的常量构成的位掩码。不匹配的节点被跳过,但是如果相关,他们的子节点可能被包括在内。可能的值是: + <table class="standard-table"> + <tbody> + <tr> + <td class="header">Constant</td> + <td class="header">Numerical value</td> + <td class="header">Description</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_ALL</code></td> + <td><code>-1</code> (that is the max value of <code>unsigned long</code>)</td> + <td>显示所有节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_ATTRIBUTE</code> {{obsolete_inline}}</td> + <td><code>2</code></td> + <td>显示属性 {{ domxref("Attr") }} 节点. 只有当用一个 {{ domxref("Attr") }} 节点作为根节点来创建 {{ domxref("NodeIterator") }} 时才有意义; 在这种情况下, 这意味着属性节点会出现在迭代或遍历的首位. 因为属性永远不会是其它节点的子节点, 当遍历整个文档树时它们不会出现.</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_CDATA_SECTION</code> {{obsolete_inline}}</td> + <td><code>8</code></td> + <td>显示{{ domxref("CDATASection") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_COMMENT</code></td> + <td><code>128</code></td> + <td>显示{{ domxref("Comment") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_DOCUMENT</code></td> + <td><code>256</code></td> + <td>显示{{ domxref("Document") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_DOCUMENT_FRAGMENT</code></td> + <td><code>1024</code></td> + <td> + <p>显示{{ domxref("DocumentFragment") }}节点。</p> + </td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_DOCUMENT_TYPE</code></td> + <td><code>512</code></td> + <td>显示{{ domxref("DocumentType") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_ELEMENT</code></td> + <td><code>1</code></td> + <td>显示{{ domxref("Element") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_ENTITY</code> {{obsolete_inline}}</td> + <td><code>32</code></td> + <td>显示 {{ domxref("Entity") }} 节点. 只有当用一个 {{ domxref("Entity") }} 节点作为它的根节点来创建一个 {{ domxref("NodeIterator") }} 时才有意义; 在这种情况下, {{ domxref("Entity") }} 节点会出现在迭代或遍历的首位. 因为 {{ domxref("Entity") }} 永远不会是其它节点的子节点, 当遍历整个文档树时它们不会出现.</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_ENTITY_REFERENCE</code> {{obsolete_inline}}</td> + <td><code>16</code></td> + <td>显示{{ domxref("EntityReference") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_NOTATION</code> {{obsolete_inline}}</td> + <td><code>2048</code></td> + <td>显示 {{ domxref("Notation") }} 节点. 只有当用一个 {{ domxref("Notation") }} 节点作为它的根节点时来创建一个 {{ domxref("NodeIterator") }} 才有意义; 在这种情况下, {{ domxref("Notation") }} 节点会出现在迭代或遍历的首位. 因为 {{ domxref("Notation") }} 永远不会是其它节点的子节点, 当遍历整个文档树时它们不会出现.</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_PROCESSING_INSTRUCTION</code></td> + <td><code>64</code></td> + <td>显示{{ domxref("ProcessingInstruction") }} 节点。</td> + </tr> + <tr> + <td><code>NodeFilter.SHOW_TEXT</code></td> + <td><code>4</code></td> + <td>显示{{ domxref("Text") }} 节点。</td> + </tr> + </tbody> + </table> + </dd> + <dt>{{domxref("NodeIterator.filter")}} {{readonlyInline}}</dt> + <dd>返回一个用来选择相关节点的 {{domxref("NodeFilter")}} .</dd> + <dt>{{domxref("NodeIterator.expandEntityReferences")}} {{readonlyInline}} {{deprecated_inline}}</dt> + <dd>Is a {{domxref("Boolean")}} indicating if, when discarding an {{domxref("EntityReference")}} its whole sub-tree must be discarded at the same time.</dd> + <dt>{{domxref("NodeIterator.referenceNode")}} {{readonlyInline}} {{experimental_inline() }}</dt> + <dd>返回当前遍历到的 {{domxref("Node")}} .</dd> + <dt>{{domxref("NodeIterator.pointerBeforeReferenceNode")}} {{readonlyInline}} {{ experimental_inline() }}</dt> + <dd>Returns a {{domxref("Boolean")}} flag that indicates whether the {{domxref("NodeIterator")}} is anchored before, the flag being <code>true</code>, or after, the flag being <code>false</code>, the anchor node.</dd> +</dl> + +<h2 id="Methods" name="Methods">方法</h2> + +<p><em>这个接口不会继承任何属性。</em></p> + +<dl> + <dt>{{domxref("NodeIterator.detach()")}} {{obsolete_inline()}}</dt> + <dd>这个方法不是必需的. 它现在什么也不做. 之前用来告诉引擎,<code>NodeIterator</code> 已经不会再使用,现在已经不做任何事情.</dd> + <dt>{{domxref("NodeIterator.previousNode()")}}</dt> + <dd>返回前一个 {{domxref("Node")}} ,如果不存在则返回 <code>null</code>.</dd> + <dt>{{domxref("NodeIterator.nextNode()")}}</dt> + <dd>返回下一个 {{domxref("Node")}} , 如果不存在则返回<code>null</code> .</dd> +</dl> + +<h2 id="Specification" name="Specification">特性</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + <tr> + <td>{{SpecName('DOM WHATWG', '#nodeiterator', 'NodeIterator')}}</td> + <td>{{Spec2('DOM WHATWG')}}</td> + <td>Added the <code>referenceNode</code> and <code>pointerBeforeReferenceNode</code> properties.<br> + Removed the <code>expandEntityReferences</code> property.<br> + The method <code>detach()</code> has been changed to be a no-op.<br> + The methods <code>previousNode()</code> and <code>nextNode()</code> don't raise an exception any more.</td> + </tr> + <tr> + <td>{{SpecName('DOM2 Traversal_Range', 'traversal.html#Iterator-overview', 'NodeIterator')}}</td> + <td>{{Spec2('DOM2 Traversal_Range')}}</td> + <td>Initial definition.</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容性">浏览器兼容性</h2> + +<p>{{CompatibilityTable}}</p> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Edge</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari</th> + </tr> + <tr> + <td>Basic support</td> + <td>1.0</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatGeckoDesktop("1.9.1")}}</td> + <td>9.0</td> + <td>9.0</td> + <td>3.0</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Edge</th> + <th>Firefox Mobile (Gecko)</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatGeckoMobile("1.9.1")}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>9.0</td> + <td>3.0</td> + </tr> + </tbody> +</table> +</div> + +<h2 id="扩展阅读">扩展阅读</h2> + +<ul> + <li>The creator method: {{domxref("Document.createNodeIterator()")}}.</li> + <li>Related interfaces: {{domxref("NodeFilter")}}, {{domxref("TreeWalker")}}.</li> +</ul> + +<p> + <audio style="display: none;"> </audio> +</p> |