--- title: Selection.collapse() slug: Web/API/Selection/collapse tags: - API - HTML Editing - Method - Selection translation_of: Web/API/Selection/collapse --- <div>{{ApiRef("DOM")}}{{SeeCompatTable}}</div> <p> <strong><code>Selection.collapse()</code></strong> 方法可以收起当前选区到一个点。文档不会发生改变。如果选区的内容是可编辑的并且焦点落在上面,则光标会在该处闪烁。</p> <h2 id="语法">语法</h2> <pre class="syntaxbox"><var>sel</var>.collapse(<var>parentNode</var>, <var>offset</var>); </pre> <h3 id="参数">参数</h3> <dl> <dt><em><code>parentNode</code></em></dt> <dd>光标落在的目标节点。</dd> </dl> <dl> <dt><em><code>offset</code></em> {{optional_inline}}</dt> <dd>落在节点的偏移量。</dd> </dl> <h2 id="例子">例子</h2> <pre class="brush: js">/* 将光标收起到文档body的开头 */ var body = document.getElementsByTagName("body")[0]; window.getSelection().collapse(body,0); </pre> <h2 id="规范">规范</h2> <table class="standard-table"> <tbody> <tr> <th scope="col">规范</th> <th scope="col">状态</th> <th scope="col">备注</th> </tr> <tr> <td>{{SpecName('Selection API', '#widl-Selection-collapse-void-Node-node-unsigned-long-offset', 'Selection.collapse()')}}</td> <td>{{Spec2('Selection API')}}</td> <td> </td> </tr> <tr> <td>{{SpecName('HTML Editing', '#dom-selection-collapse', 'Selection.collapse()')}}</td> <td>{{Spec2('HTML Editing')}}</td> <td>Initial definition</td> </tr> </tbody> </table> <h2 id="浏览器兼容性">浏览器兼容性</h2> <div>{{Compat("api.Selection.collapse")}}</div> <div id="compat-mobile"> </div> <h2 id="相关连接">相关连接</h2> <ul> <li>{{domxref("Selection")}}, 本方法所属的接口.</li> </ul>