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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/Window/customElements below:

Window.customElements - Web API | MDN

Baseline Widely available

customElements 是 Window 对象上的一个只读属性，接口返回一个 CustomElementRegistry 对象的引用，可用于注册新的 custom element，或者获取之前定义过的自定义元素的信息。

这个属性最常用的例子是用来获取使用CustomElementRegistry.define()方法定义和注册的自定义元素，例如：

let customElementRegistry = window.customElements;
customElementRegistry.define("my-custom-element", MyCustomElement);

However, it is usually shortened to something like the following:

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),
      );
    }
  },
);

参阅我们的 web-components-examples 获取更多有用的例子。

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