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---
id: 5a24c314108439a4d4036181
title: 介绍内联样式
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
还有其他复杂的概念可以为 React 代码增加强大的功能。 但是,你可能会想知道更简单的问题,比如:如何对在 React 中创建的 JSX 元素添加样式。 你可能知道,由于[将 class 应用于 JSX 元素的方式](/learn/front-end-development-libraries/react/define-an-html-class-in-jsx)与 HTML 中的使用并不完全相同。
如果从样式表导入样式,它就没有太大的不同。 使用 `className` 属性将 class 应用于 JSX 元素,并将样式应用于样式表中的 class。 另一种选择是使用内联样式,这在 ReactJS 开发中非常常见。
将内联样式应用于 JSX 元素,类似于在 HTML 中的操作方式,但有一些 JSX 差异。 以下是 HTML 中内联样式的示例:
```jsx
<div style="color: yellow; font-size: 16px">Mellow Yellow</div>
```
JSX 元素使用 `style` 属性,但是鉴于 JSX 的编译方式,不能将值设置为 `string`(字符串)。 相反你应该将其设置为等于JavaScript `object` 。 如下所示:
```jsx
<div style={{color: "yellow", fontSize: 16}}>Mellow Yellow</div>
```
注意到如何驼峰拼写 `fontSize` 属性了吗? 这是因为 React 不接受样式对象中的 kebab-case 键。 React 将在 HTML 中为应用正确的属性名称。
# --instructions--
在代码编辑器中给 `div` 添加一个 `style` 属性,将文本颜色设置为红色,字体大小设置为 `72px`
请注意,可以选择将字体大小设置为数字,省略单位 `px`,或者将其写为 `72px`
# --hints--
组件应该渲染一个 `div` 元素。
```js
assert(
(function () {
const mockedComponent = Enzyme.mount(React.createElement(Colorful));
return mockedComponent.children().type() === 'div';
})()
);
```
`div` 元素的颜色应该是 `red`(红色)。
```js
assert(
(function () {
const mockedComponent = Enzyme.mount(React.createElement(Colorful));
return mockedComponent.children().props().style.color === 'red';
})()
);
```
`div` 元素的字体大小应为 `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>
);
}
};
```