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---
title: Window.customElements
slug: Web/API/Window/customElements
tags:
- API
- CustomElementRegistry
- Property
- Reference
- Web Components
- Window
- custom elements
- customElements
translation_of: Web/API/Window/customElements
---
<div>{{APIRef}}</div>
<p><span class="seoSummary"><strong><code>customElements</code></strong> 是{{domxref("Window")}}对象上的一个只读属性，接口返回一个{{domxref("CustomElementRegistry")}} 对象的引用，可用于注册新的 <a href="/en-US/docs/Web/Web_Components/Using_custom_elements">custom elements</a>，或者获取之前定义过的自定义元素的信息。</span></p>
<h2 id="例子">例子</h2>
<p>这个属性最常用的例子是用来获取使用{{domxref("CustomElementRegistry.define()")}}方法定义和注册的自定义元素，例如：</p>
<pre class="brush: js">let customElementRegistry = window.customElements;
customElementRegistry.define('my-custom-element', MyCustomElement);</pre>
<p>However, it is usually shortened to something like the following:</p>
<pre class="brush: js">customElements.define('element-details',
class extends HTMLElement {
constructor() {
super();
const template = document
.getElementById('element-details-template')
.content;
const shadowRoot = this.attachShadow({mode: 'open'})
.appendChild(template.cloneNode(true));
}
});</pre>
<p>参阅我们的 <a href="https://github.com/mdn/web-components-examples/">web-components-examples</a> 获取更多有用的例子。</p>
<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("HTML WHATWG", "custom-elements.html#dom-window-customelements", "window.customElements")}}</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>
<p>{{Compat("api.Window.customElements")}}</p>
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