ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
85 lines
2.4 KiB
Markdown
85 lines
2.4 KiB
Markdown
---
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id: 5a24c314108439a4d4036168
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title: 从零开始写一个 React 组件
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challengeType: 6
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forumTopicId: 301424
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dashedName: write-a-react-component-from-scratch
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---
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# --description--
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现在你已经了解了 JSX 和 React 组件的基础知识，现在是时候自己编写一个组件了。React 组件是 React 应用程序的核心组成部分，因此熟练编写它们是非常重要的。记住，典型的 React 组件是 ES6`class`，它扩展了`React.Component`。它有一个返回 HTML（从 JSX 返回）或`null`的渲染方法，这是 React 组件的基本形式。一旦你深刻地理解了这一点，你就可以开始构建更复杂的 React 项目了。
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# --instructions--
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定义一个`MyComponent`类，它是`React.Component`的扩展。它的渲染方法应该返回一个`div`，其中包含一个`h1`标签，标签文本为：`My First React Component!`。请确保文本内容、大小写和标点符号正确，以及调用了组件的构造函数。
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使用`ReactDOM.render()`把该组件渲染到 DOM 中。有一个`id='challenge-node'`的`div`可供你使用。
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# --hints--
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应该有一个名为`MyComponent`的React组件。
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```js
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(getUserInput) =>
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assert(
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getUserInput('index')
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.replace(/\s/g, '')
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.includes('classMyComponentextendsReact.Component{')
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);
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```
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`MyComponent`应该包含一个`h1`标签，标签的文本为`My First React Component!`，区分大小写并有标点符号。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(MyComponent));
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return mockedComponent.find('h1').text() === 'My First React Component!';
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})()
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);
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```
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`MyComponent`应该渲染到 DOM。
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```js
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assert(document.getElementById('challenge-node').childNodes.length === 1);
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```
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`MyComponent` 应该有一个构造器，里面调用了传参 `props` 的 `super` 函数。
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```js
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assert(
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MyComponent.toString().includes('MyComponent(props)') &&
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MyComponent.toString().includes('_super.call(this, props)')
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);
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```
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# --seed--
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## --seed-contents--
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```jsx
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// Change code below this line
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```
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# --solutions--
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```jsx
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// Change code below this line
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class MyComponent extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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return (
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<div>
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<h1>My First React Component!</h1>
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</div>
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);
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}
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};
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ReactDOM.render(<MyComponent />, document.getElementById('challenge-node'));
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```
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