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---
title: CustomElementRegistry.upgrade()
slug: Web/API/CustomElementRegistry/upgrade
translation_of: Web/API/CustomElementRegistry/upgrade
---
<p>{{APIRef("CustomElementRegistry")}}</p>
<p>CustomElementRegistry接口的upgrade()方法将更新节点子树中所有包含阴影的自定义元素，甚至在它们连接到主文档之前也是如此。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">customElements.upgrade(<em>root</em>);
</pre>
<h3 id="参数">参数</h3>
<dl>
<dt><code>root</code></dt>
<dd>待升级的包含阴影的派生元素<code>节点</code> 。如果没有可升级的派生实例，则不会抛出异常。</dd>
</dl>
<h3 id="返回值">返回值</h3>
<p>空.</p>
<h2 id="示例">示例</h2>
<p>摘至<a href="https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-upgrade">HTML 规范</a>:</p>
<pre class="brush: js">const el = document.createElement("spider-man");
class SpiderMan extends HTMLElement {}
customElements.define("spider-man", SpiderMan);
console.assert(!(el instanceof SpiderMan)); // not yet upgraded
customElements.upgrade(el);
console.assert(el instanceof SpiderMan); // upgraded!
</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("HTML WHATWG", "custom-elements.html#dom-customelementregistry-upgrade", "customElements.upgrade()")}}</td>
<td>{{Spec2("HTML WHATWG")}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器支持">浏览器支持</h2>
<div>
<p>{{Compat("api.CustomElementRegistry.upgrade")}}</p>
</div>
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