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---
title: CustomElementRegistry.get()
slug: Web/API/CustomElementRegistry/get
tags:
- CustomElementRegistry
- Experimental
- Web Components
- custom elements
translation_of: Web/API/CustomElementRegistry/get
---
<p>{{APIRef("CustomElementRegistry")}}</p>
<p><span class="seoSummary"> {{domxref("CustomElementRegistry")}} 的<code><strong>get()</strong></code>方法返回以前定义自定义元素的构造函数.</span></p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><em>constructor</em> = customElements.get(<em>name</em>);
</pre>
<h3 id="参数">参数</h3>
<dl>
<dt>name</dt>
<dd>你想要返回引用的构造函数的自定义元素的名字。</dd>
</dl>
<h3 id="返回值">返回值</h3>
<p>指定名字的自定义元素的构造函数，如果没有使用该名称的自定义元素定义，则为<code>undefined</code>。</p>
<h2 id="例子">例子</h2>
<pre class="brush: js">customElements.define('my-paragraph',
class extends HTMLElement {
constructor() {
super();
let template = document.getElementById('my-paragraph');
let templateContent = template.content;
const shadowRoot = this.attachShadow({mode: 'open'})
.appendChild(templateContent.cloneNode(true));
}
})
// Return a reference to the my-paragraph constructor
<span class="message-body-wrapper"><span class="message-flex-body"><span class="devtools-monospace message-body">let ctor = customElements.get('my-paragraph');</span></span></span>
</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-get", "customElements.get()")}}</td>
<td>{{Spec2("HTML WHATWG")}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div>
<p>{{Compat("api.CustomElementRegistry.get")}}</p>
</div>
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