* chore: rename APIs and Microservices to include "Backend" (#42515) * fix typo * fix typo * undo change * Corrected grammar mistake Corrected a grammar mistake by removing a comma. * change APIs and Microservices cert title * update title * Change APIs and Microservices certi title * Update translations.json * update title * feat(curriculum): rename apis and microservices cert * rename folder structure * rename certificate * rename learn Markdown * apis-and-microservices -> back-end-development-and-apis * update backend meta * update i18n langs and cypress test Co-authored-by: Shaun Hamilton <shauhami020@gmail.com> * fix: add development to front-end libraries (#42512) * fix: added-the-word-Development-to-front-end-libraries * fix/added-the-word-Development-to-front-end-libraries * fix/added-word-development-to-front-end-libraries-in-other-related-files * fix/added-the-word-Development-to-front-end-and-all-related-files * fix/removed-typos-from-last-commit-in-index.md * fix/reverted-changes-that-i-made-to-dependecies * fix/removed xvfg * fix/reverted changes that i made to package.json * remove unwanted changes * front-end-development-libraries changes * rename backend certSlug and README * update i18n folder names and keys * test: add legacy path redirect tests This uses serve.json from the client-config repo, since we currently use that in production * fix: create public dir before moving serve.json * fix: add missing script * refactor: collect redirect tests * test: convert to cy.location for stricter tests * rename certificate folder to 00-certificates * change crowdin config to recognise new certificates location * allow translations to be used Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> * add forwards slashes to path redirects * fix cypress path tests again * plese cypress * fix: test different challenge Okay so I literally have no idea why this one particular challenge fails in Cypress Firefox ONLY. Tom and I paired and spun a full build instance and confirmed in Firefox the page loads and redirects as expected. Changing to another bootstrap challenge passes Cypress firefox locally. Absolutely boggled by this. AAAAAAAAAAAAAAA * fix: separate the test Okay apparently the test does not work unless we separate it into a different `it` statement. >:( >:( >:( >:( Co-authored-by: Sujal Gupta <55016909+heysujal@users.noreply.github.com> Co-authored-by: Noor Fakhry <65724923+NoorFakhry@users.noreply.github.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
135 lines
3.2 KiB
Markdown
135 lines
3.2 KiB
Markdown
---
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id: 5a24c314108439a4d4036164
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title: 用組合的方式創建一個 React 組件
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challengeType: 6
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forumTopicId: 301383
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dashedName: create-a-component-with-composition
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---
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# --description--
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現在來看看如何組合多個 React 組件。 想象一下,現在正在構建一個應用程序,並創建了三個組件:`Navbar`、`Dashboard` 和 `Footer`。
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要將這些組件組合在一起,可以創建一個 `App` *父組件*,將這三個組件分別渲染成爲*子組件*。 要在 React 組件中渲染一個子組件,需要在 JSX 中包含作爲自定義 HTML 標籤編寫的組件名稱。 例如,在 `render` 方法中,可以這樣編寫:
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```jsx
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return (
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<App>
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<Navbar />
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<Dashboard />
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<Footer />
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</App>
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)
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```
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當 React 遇到一個自定義 HTML 標籤引用另一個組件的時(如本例所示,組件名稱包含在 `< />` 中),它在自定義標籤的位置渲染該組件的標籤。 這可以說明 `App` 組件和 `Navbar`、`Dashboard` 以及 `Footer` 之間的父子關係。
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# --instructions--
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在代碼編輯器中,有一個名爲 `ChildComponent` 的簡單功能組件和一個名爲 `ParentComponent` 的 React 組件。 通過在 `ParentComponent` 中渲染 `ChildComponent` 來將兩者組合在一起。 確保使用正斜槓關閉 `ChildComponent` 標籤。
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**注意:** `ChildComponent` 是使用 ES6 的箭頭函數定義的,這是使用 React 時非常常見的做法。 但是,要知道這只是一個函數。 如果你不熟悉箭頭函數語法,請參閱 JavaScript 部分。
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# --hints--
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React 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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var shallowRender = Enzyme.shallow(React.createElement(ParentComponent));
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return shallowRender.type() === 'div';
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})()
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);
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```
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組件應該返回兩個嵌套的元素。
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```js
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assert(
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(function () {
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var shallowRender = Enzyme.shallow(React.createElement(ParentComponent));
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return shallowRender.children().length === 2;
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})()
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);
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```
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組件的第二個子元素應該是 `ChildComponent`。
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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(ParentComponent));
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return (
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mockedComponent.find('ParentComponent').find('ChildComponent').length ===
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1
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);
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})()
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);
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```
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# --seed--
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## --after-user-code--
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```jsx
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ReactDOM.render(<ParentComponent />, document.getElementById('root'))
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```
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## --seed-contents--
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```jsx
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const ChildComponent = () => {
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return (
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<div>
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<p>I am the child</p>
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</div>
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);
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};
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class ParentComponent 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>I am the parent</h1>
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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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```
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# --solutions--
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```jsx
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const ChildComponent = () => {
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return (
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<div>
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<p>I am the child</p>
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</div>
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);
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};
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class ParentComponent 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>I am the parent</h1>
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{ /* Change code below this line */ }
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<ChildComponent />
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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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```
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