JavaScript教程资源分享门户(2)

Here’s an example:

<!-- Load polyfills; note that "loader" will load these async -->
<script src="node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js" defer></script>
<!-- Load a custom element definitions in `waitFor` and return a promise -->
<script type="module">
  WebComponents.waitFor(() => {
    // At this point we are guaranteed that all required polyfills have
    // loaded, and can use web components API's.
    // The standard pattern is to load element definitions that call
    // `customElements.define` here.
    // Note: returning the import's promise causes the custom elements
    // polyfill to wait until all definitions are loaded and then upgrade
    // the document in one batch, for better performance.
    return import('my-element.js');
  });
</script>
<!-- Use the custom element -->
<my-element></my-element>

The WebComponents.waitFor function may be called multiple times, and the callback functions will be processed in order.

Here’s a more complicated example:

<!-- Load polyfills; note that "loader" will load these async -->
<script src="node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js" defer></script>
<script type="module">
  WebComponents.waitFor(async () => {
    if (!window.fetch) {
      await import('node_modules/fetch-polyfill/fetch.js');
    }
    return import('my-element.js');
  })
</script>
<script type="module">
</script>

The WebComponentsReady event is fired when polyfills and user scripts have loaded and custom elements have been upgraded. This event is generally not needed; however, it may be useful in some cases like testing. If imperative code should wait until a specific custom element definition has loaded, it can use the platform customElements.whenDefined API.

According to the spec, only ES6 classes (https://html.spec.whatwg.org/multipage/scripting.html#custom-element-conformance) may be passed to the native customElements.define API. For best performnace, ES6 should be served to browsers that support it, and ES5 code should be serve to those that don’t. Since this may not always be possible, it may make sense to compile and serve ES5 to all browsers. However, if you do so, ES5-style custom element classes will now not work on browsers with native Custom Elements because ES5-style classes cannot properly extend ES6 classes, like HTMLElement.

As a workaround, if your project has been compiled to ES5, load custom-elements-es5-adapter.js before defining Custom Elements. This adapter will automatically wrap ES5.

The adapter must NOT be compiled.

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PolyfillEdgeIE11+Chrome*Firefox*Safari 9+*Chrome Android*Mobile Safari*

Custom Elements

Shady CSS/DOM

*Indicates the current version of the browser

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Now you are ready to build the polyfills with:

# install dependencies
npm install
# build
npm run build

The builds will be placed into the root directory.

See the contributing guide

Everything in this repository is BSD style license unless otherwise specified.

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