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+---
+title: Range.collapse()
+slug: Web/API/Range/collapse
+translation_of: Web/API/Range/collapse
+---
+<div>{{APIRef("DOM")}}</div>
+
+<p><code><strong>Range.collapse()</strong></code> 方法向边界点折叠该 {{domxref("Range")}} 。</p>
+
+<p>折叠后的 {{domxref("Range")}} 为空，不包含任何内容。</p>
+
+<p>要确定 {{domxref("Range")}} 是否已折叠，使用{{domxref("Range.collapsed")}} 属性。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>range</em>.collapse(<em>toStart</em>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><em>toStart </em>{{optional_inline}}</dt>
+ <dd>一个布尔值： <code>true</code> 折叠到 {{domxref("Range")}} 的 start 节点，<code>false</code> 折叠到 end 节点。如果省略，则默认为 false {{experimental_inline}}<code>.</code></dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush:js">var range = document.createRange();
+
+referenceNode = document.getElementsByTagName("div").item(0);
+range.selectNode(referenceNode);
+range.collapse(true);
+</pre>
+
+<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('DOM WHATWG', '#dom-range-collapse', 'Range.collapse()')}}</td>
+   <td>{{Spec2('DOM WHATWG')}}</td>
+   <td>The parameter is now optional and default to <code>false</code>.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Traversal_Range', 'ranges.html#Level2-Range-method-collapse', 'Range.collapse()')}}</td>
+   <td>{{Spec2('DOM2 Traversal_Range')}}</td>
+   <td>Initial specification.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div id="compat-desktop">{{Compat("api.Range.collapse")}}</div>
+
+<h2 id="参阅">参阅</h2>
+
+<ul>
+ <li><a href="/en-US/docs/DOM/DOM_Reference">The DOM interfaces index</a></li>
+</ul>