55 lines
2.5 KiB
Markdown
55 lines
2.5 KiB
Markdown
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---
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id: 5a24c314108439a4d4036168
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title: Write a React Component from Scratch
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challengeType: 6
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isRequired: false
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videoUrl: ''
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localeTitle: 从Scratch写一个React组件
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---
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## Description
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<section id="description">现在您已经学习了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应用程序的核心构建块，因此非常熟悉编写它们非常重要。请记住，典型的React组件是扩展<code>React.Component</code>的ES6 <code>class</code> 。它有一个返回HTML（来自JSX）或<code>null</code>的render方法。这是React组件的基本形式。一旦你理解了这一点，你就会准备开始构建更复杂的React项目。 </section>
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## Instructions
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<section id="instructions">定义一个扩展<code>React.Component</code>的类<code>MyComponent</code> 。它的render方法应该返回一个<code>div</code> ，其中包含一个带有文本的<code>h1</code>标签： <code>My First React Component!</code>在里面。准确使用此文本，案例和标点符号很重要。确保也调用组件的构造函数。使用<code>ReactDOM.render()</code>将此组件呈现给DOM。有一个<code>div</code> ， <code>id='challenge-node'</code>可供您使用。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 应该有一个名为<code>MyComponent</code>的React组件。
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testString: 'getUserInput => assert(getUserInput("index").replace(/\s/g, "").includes("classMyComponentextendsReact.Component{"), "There should be a React component called <code>MyComponent</code>.");'
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- text: <code>MyComponent</code>应该包含带有文本<code>My First React Component!</code>的<code>h1</code>标签<code>My First React Component!</code>案例和标点符号问题。
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testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("h1").text() === "My First React Component!"; })(), "<code>MyComponent</code> should contain an <code>h1</code> tag with text <code>My First React Component!</code> Case and punctuation matter.");'
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- text: <code>MyComponent</code>应该呈现给DOM。
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testString: 'assert(document.getElementById("challenge-node").childNodes.length === 1, "<code>MyComponent</code> should render to the DOM.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='jsx-seed'>
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```jsx
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// change code below this line
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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