You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

57 lines
2.1 KiB

---
id: webcomponents-zh-CN
title: Web Components
Upgrade to Jekyll 3 Full list of changes is at https://jekyllrb.com/docs/upgrading/2-to-3/. The tl;dr of it is: - Relative permalinks were removed, so all the files in the `docs` subdirectory need their permalink to be prefixed with `docs/` - `post` and `page` types were renamed to `posts` and `pages` respectively - `jekyll-paginate`, `pygments` and `redcarpet` are all now optional, so I needed to explicitly add it to the Gemfile. Jekyll now uses `rouge` rather than `pygments` for syntax highlighting, but rouge does not support highlighting individual lines (`hl_lines`) so we need to continue using Pygments. - Layout metadata (eg. `sectionid`) is now on a `layout` variable rather than `page` Tested the following pages and confirmed that they all work: - "Docs" link (getting started page): http://127.0.0.1:4000/react/docs/getting-started.html - Downloads: http://127.0.0.1:4000/react/downloads.html - Tutorial: http://127.0.0.1:4000/react/docs/tutorial.html - A few pages under the "docs" subdirectory, to confirm they're working properly: - http://127.0.0.1:4000/react/docs/addons.html - http://127.0.0.1:4000/react/docs/why-react.html - http://127.0.0.1:4000/react/docs/create-fragment.html - A few tips: - http://127.0.0.1:4000/react/tips/false-in-jsx.html - http://127.0.0.1:4000/react/tips/style-props-value-px.html - Non-English versions of the page: - http://127.0.0.1:4000/react/docs/getting-started-it-IT.html - http://127.0.0.1:4000/react/docs/getting-started-ja-JP.html
9 years ago
permalink: docs/webcomponents-zh-CN.html
prev: reconciliation-zh-CN.html
next: glossary-zh-CN.html
---
因为React和Web组件是用来解决不同问题的, 试图比较两者将不可避免地导致似是而非的结论, 。Web组件为可复用组件提供了强大的封装, 而React则提供了一个使DOM与你的数据同步的声明式库。两者的目标是互补的;工程师可以混合使用这些技术。作为一个开发者,你可以在你的Web组件中使用React,或者在React中使用Web组件,或者两者一起使用。
## 在React中使用Web组件
```javascript
class HelloMessage extends React.Component{
render() {
return <div>Hello <x-search>{this.props.name}</x-search>!</div>;
}
}
```
> 注意:
>
> 两个组件系统的程序模型 (web 组件 与 react 组件) 区别在
> web组件通常暴露一个命令式的API (比如 一个 `video` web 组件可能暴露 `play()`
> 与 `pause()` 函数)。 因为web 组件是它们属性的声明式函数,
> 他们应该可以执行, 但是如果要访问命令式API的一个web组件, 你将需要在组件上附加一个引用
> 并与DOM节点直接交互。如果你在使用第三方web组件,
> 我们推荐你写一个React组件作为你的web组件的封装。
>
> 当前,一个由web组件触发的事件可能不能准确地在React渲染树中传递。
> 你将需要手动附加event handlers来在你的react组件中处理这些事件。
## 在Web 组件中使用React
```javascript
var proto = Object.create(HTMLElement.prototype, {
attachedCallback: {
value: function() {
var mountPoint = document.createElement('span');
this.createShadowRoot().appendChild(mountPoint);
var name = this.getAttribute('name');
var url = 'https://www.google.com/search?q=' + encodeURIComponent(name);
ReactDOM.render(<a href={url}>{name}</a>, mountPoint);
}
}
});
document.registerElement('x-search', {prototype: proto});
```
## 完整样例
若要查看完整样例,请参照[starter kit](/react/downloads.html)中的`webcomponents`例子。