Files

104 lines
2.9 KiB
Markdown
Raw Permalink Normal View History

---
id: 5a24c314108439a4d4036181
title: 介紹內聯樣式
challengeType: 6
forumTopicId: 301395
dashedName: introducing-inline-styles
---
# --description--
feat: add 'back/front end' in curriculum (#42596) * 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>
2021-08-14 03:57:13 +01:00
還有其他複雜的概念可以爲 React 代碼增加強大的功能。 但是,你可能會想知道更簡單的問題,比如:如何對在 React 中創建的 JSX 元素添加樣式。 你可能知道,由於[將 class 應用於 JSX 元素的方式](/learn/front-end-development-libraries/react/define-an-html-class-in-jsx)與 HTML 中的使用並不完全相同。
如果從樣式表導入樣式,它就沒有太大的不同。 使用 `className` 屬性將 class 應用於 JSX 元素,並將樣式應用於樣式表中的 class。 另一種選擇是使用內聯樣式,這在 ReactJS 開發中非常常見。
將內聯樣式應用於 JSX 元素,類似於在 HTML 中的操作方式,但有一些 JSX 差異。 以下是 HTML 中內聯樣式的示例:
```jsx
<div style="color: yellow; font-size: 16px">Mellow Yellow</div>
```
JSX 元素使用 `style` 屬性,但是鑑於 JSX 的編譯方式,不能將值設置爲 `string`(字符串)。 相反你應該將其設置爲等於JavaScript `object` 。 如下所示:
```jsx
<div style={{color: "yellow", fontSize: 16}}>Mellow Yellow</div>
```
注意到如何駝峯拼寫 `fontSize` 屬性了嗎? 這是因爲 React 不接受樣式對象中的 kebab-case 鍵。 React 將在 HTML 中爲應用正確的屬性名稱。
# --instructions--
在代碼編輯器中給 `div` 添加一個 `style` 屬性,將文本顏色設置爲紅色,字體大小設置爲 `72px`
請注意,可以選擇將字體大小設置爲數字,省略單位 `px`,或者將其寫爲 `72px`
# --hints--
組件應該渲染一個 `div` 元素。
```js
assert(
(function () {
const mockedComponent = Enzyme.mount(React.createElement(Colorful));
return mockedComponent.children().type() === 'div';
})()
);
```
`div` 元素的顏色應該是 `red`(紅色)。
```js
assert(
(function () {
const mockedComponent = Enzyme.mount(React.createElement(Colorful));
return mockedComponent.children().props().style.color === 'red';
})()
);
```
`div` 元素的字體大小應爲 `72px`
```js
assert(
(function () {
const mockedComponent = Enzyme.mount(React.createElement(Colorful));
return (
mockedComponent.children().props().style.fontSize === 72 ||
mockedComponent.children().props().style.fontSize === '72' ||
mockedComponent.children().props().style.fontSize === '72px'
);
})()
);
```
# --seed--
## --after-user-code--
```jsx
ReactDOM.render(<Colorful />, document.getElementById('root'))
```
## --seed-contents--
```jsx
class Colorful extends React.Component {
render() {
return (
<div>Big Red</div>
);
}
};
```
# --solutions--
```jsx
class Colorful extends React.Component {
render() {
return (
<div style={{color: "red", fontSize: 72}}>Big Red</div>
);
}
};
```