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+---
+title: XPathEvaluator
+slug: Web/API/XPathEvaluator
+tags:
+  - API
+  - DOM
+  - DOM XPath API
+  - Document
+  - Interface
+  - NeedsTranslation
+  - Reference
+  - TopicStub
+  - XML
+  - XPath
+  - XPathEvaluator
+translation_of: Web/API/XPathEvaluator
+---
+<p>{{APIRef("DOM XPath")}}</p>
+
+<p> <code>XPathEvaluator</code>  接口能够对 {{Glossary("XPath")}} 表达式进行编译和求值。</p>
+
+<p>该接口实现自{{domxref("Document")}}的接口。</p>
+
+<h2 id="Methods" name="Methods">方法</h2>
+
+<dl>
+ <dt>{{DOMxRef("XPathEvaluator.createExpression()")}}</dt>
+ <dd>创建一个解析过的XPath和解析后的namespaces</dd>
+ <dt>{{DOMxRef("XPathEvaluator.createNSResolver()")}}</dt>
+ <dd>任意DOM节点能够通过该方法来解析namespaces，允许通过节点出现在文档中的相对上下文对XPath表达式进行求值。</dd>
+ <dt>{{DOMxRef("XPathEvaluator.evaluate()")}}</dt>
+ <dd>对XPath字符串求值，返回可能的确切类型的匹配结果。</dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<p>下面的实例展示了如何使用<code>XPathEvaluator</code>接口。</p>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div&gt;XPath example&lt;/div&gt;
+&lt;div&gt;Number of &amp;lt;div&amp;gt;s: &lt;output&gt;&lt;/output&gt;&lt;/div&gt;
+</pre>
+
+<h3 id="JavaScript">JavaScript</h3>
+
+<pre class="brush: js">var xpath = "//div";
+var evaluator = new XPathEvaluator();
+var expression = evaluator.createExpression("//div");
+var result = expression.evaluate(document, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE);
+document.querySelector("output").textContent = result.snapshotLength;
+</pre>
+
+<h3 id="结果"> 结果</h3>
+
+
+
+<p>{{EmbedLiveSample('Example', 400, 70)}}</p>
+
+<h2 id="规范">规范</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("DOM3 XPath", "xpath.html#XPathEvaluator", "XPathEvaluator")}}</td>
+   <td>{{Spec2("DOM3 XPath")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.XPathEvaluator")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("document.createExpression()")}}</li>
+ <li>{{domxref("XPathExpression")}}</li>
+</ul>