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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Node.replaceChild()
+slug: Web/API/Node/replaceChild
+tags:
+ - API
+ - DOM
+ - Node
+ - 参考
+ - 方法
+translation_of: Web/API/Node/replaceChild
+---
+<div>{{APIRef("DOM")}}</div>
+
+<p><strong><code>Node.replaceChild()</code></strong> 方法用指定的节点替换当前节点的一个子节点,并返回被替换掉的节点。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>parentNode</var>.replaceChild(<var>newChild</var>, <var>oldChild</var>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code><strong>newChild</strong></code></dt>
+ <dd>用来替换 <code>oldChild</code> 的新节点。如果该节点已经存在于 DOM 树中,则它首先会被从原始位置删除。</dd>
+ <dt><code><strong>oldChild</strong></code></dt>
+ <dd>被替换掉的原始节点。</dd>
+</dl>
+
+<ul>
+</ul>
+
+<h3 id="返回值">返回值</h3>
+
+<p>The returned value is the replaced node. This is the same node as <code>oldChild</code>.</p>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">// &lt;div&gt;
+// &lt;span id="childSpan"&gt;foo bar&lt;/span&gt;
+// &lt;/div&gt;
+
+// 创建一个空的span元素节点
+// 没有id,没有任何属性和内容
+var sp1 = document.createElement("span");
+
+// 添加一个id属性,值为'newSpan'
+sp1.setAttribute("id", "newSpan");
+
+// 创建一个文本节点
+var sp1_content = document.createTextNode("新的span元素的内容.");
+
+// 将文本节点插入到span元素中
+sp1.appendChild(sp1_content);
+
+// 获得被替换节点和其父节点的引用.
+var sp2 = document.getElementById("childSpan");
+var parentDiv = sp2.parentNode;
+
+// 用新的span元素sp1来替换掉sp2
+parentDiv.replaceChild(sp1, sp2);
+
+// 结果:
+// &lt;div&gt;
+// &lt;span id="newSpan"&gt;新的span元素的内容.&lt;/span&gt;
+// &lt;/div&gt;
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">规范</th>
+ <th scope="col">状态</th>
+ <th scope="col">备注</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName("DOM WHATWG", "#dom-node-replacechild", "Node: replaceChild")}}</td>
+ <td>{{Spec2("DOM WHATWG")}}</td>
+ <td></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.Node.replaceChild")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{domxref("Node.removeChild")}}</li>
+ <li>{{domxref("ChildNode.replaceWith")}}</li>
+</ul>