200 lines
4.2 KiB
Markdown
200 lines
4.2 KiB
Markdown
---
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id: 5a24c314108439a4d4036166
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title: 組合 React 組件
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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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隨着挑戰繼續,將組合使用更復雜的 React 組件和 JSX,有一點需要注意。 在其它組件中渲染 ES6 風格的類組件和渲染在過去幾個挑戰中使用的簡單組件沒有什麼不同。 可以在其它組件中渲染 JSX 元素、無狀態功能組件和 ES6 類組件。
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# --instructions--
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在代碼編輯器中,`TypesOfFood` 組件已經渲染了一個名爲 `Vegetables` 的組件。 此外,還有上次挑戰中的 `Fruits` 組件。
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在 `Fruits` 中嵌套兩個組件,首先 `NonCitrus`,然後是 `Citrus`, 這兩個組件都已經引入。 接下來,將 `Fruits` 類組件嵌套到 `TypesOfFood` 組件中,位於 `h1` 標題元素下方和 `Vegetables` 上方。 結果應該是一系列嵌套的組件,它們使用兩種不同的組件類型。
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# --hints--
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`TypesOfFood` 組件應該返回單個 `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` 組件應該返回 `Fruits` 組件。
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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` 組件應該返回 `NonCitrus` 組件和 `Citrus` 組件。
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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` 組件應該返回 `Vegetables` 組件,且其位於 `Fruits` 組件之下。
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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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