200 lines
4.2 KiB
Markdown
200 lines
4.2 KiB
Markdown
---
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id: 5a24c314108439a4d4036166
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title: 组合 React 组件
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challengeType: 6
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forumTopicId: 301381
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dashedName: compose-react-components
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---
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# --description--
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随着挑战继续,将组合使用更复杂的 React 组件和 JSX,有一点需要注意。 在其它组件中渲染 ES6 风格的类组件和渲染在过去几个挑战中使用的简单组件没有什么不同。 可以在其它组件中渲染 JSX 元素、无状态功能组件和 ES6 类组件。
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# --instructions--
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在代码编辑器中,`TypesOfFood` 组件已经渲染了一个名为 `Vegetables` 的组件。 此外,还有上次挑战中的 `Fruits` 组件。
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在 `Fruits` 中嵌套两个组件,首先 `NonCitrus`,然后是 `Citrus`, 这两个组件都已经引入。 接下来,将 `Fruits` 类组件嵌到 `TypesOfFood` 组件中,位于 `h1` 标题下方和 `Vegetables` 上方。 结果应该是一系列嵌套的组件,它们使用两种不同的组件类型。
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# --hints--
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`TypesOfFood` 组件应该返回单个 `div` 元素。
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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(TypesOfFood));
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return mockedComponent.children().type() === 'div';
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})()
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);
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```
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`TypesOfFood` 组件应该返回 `Fruits` 组件。
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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(TypesOfFood));
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return mockedComponent.children().childAt(1).name() === 'Fruits';
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})()
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);
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```
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`Fruits` 组件应该返回 `NonCitrus` 组件和 `Citrus` 组件。
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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(TypesOfFood));
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return (
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mockedComponent.find('Fruits').children().find('NonCitrus').length ===
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1 &&
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mockedComponent.find('Fruits').children().find('Citrus').length === 1
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);
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})()
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);
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```
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`TypesOfFood` 组件应该返回 `Vegetables` 组件,且其位于 `Fruits` 组件之下。
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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(TypesOfFood));
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return mockedComponent.children().childAt(2).name() === 'Vegetables';
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})()
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);
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```
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# --seed--
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## --before-user-code--
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```jsx
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class NonCitrus extends React.Component {
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render() {
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return (
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<div>
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<h4>Non-Citrus:</h4>
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<ul>
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<li>Apples</li>
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<li>Blueberries</li>
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<li>Strawberries</li>
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<li>Bananas</li>
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</ul>
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</div>
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);
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}
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};
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class Citrus extends React.Component {
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render() {
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return (
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<div>
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<h4>Citrus:</h4>
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<ul>
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<li>Lemon</li>
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<li>Lime</li>
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<li>Orange</li>
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<li>Grapefruit</li>
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</ul>
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</div>
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);
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}
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};
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class Vegetables extends React.Component {
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render() {
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return (
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<div>
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<h2>Vegetables:</h2>
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<ul>
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<li>Brussel Sprouts</li>
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<li>Broccoli</li>
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<li>Squash</li>
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</ul>
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</div>
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);
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}
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};
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```
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## --after-user-code--
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```jsx
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ReactDOM.render(<TypesOfFood />, document.getElementById('root'))
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```
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## --seed-contents--
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```jsx
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class Fruits 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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<h2>Fruits:</h2>
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{ /* Change code below this line */ }
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{ /* Change code above this line */ }
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</div>
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);
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}
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};
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class TypesOfFood 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>Types of Food:</h1>
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{ /* Change code below this line */ }
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{ /* Change code above this line */ }
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<Vegetables />
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</div>
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);
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}
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};
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```
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# --solutions--
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```jsx
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class Fruits 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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<h2>Fruits:</h2>
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{ /* Change code below this line */ }
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<NonCitrus />
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<Citrus />
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{ /* Change code above this line */ }
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</div>
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)
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}
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}
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class TypesOfFood 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>Types of Food:</h1>
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{ /* Change code below this line */ }
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<Fruits />
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{ /* Change code above this line */ }
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<Vegetables />
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</div>
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);
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}
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};
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```
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