* 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>
187 lines
4.7 KiB
Markdown
187 lines
4.7 KiB
Markdown
---
|
|
id: 5a24c314108439a4d403616a
|
|
title: 传递一个数组作为 Props
|
|
challengeType: 6
|
|
forumTopicId: 301401
|
|
dashedName: pass-an-array-as-props
|
|
---
|
|
|
|
# --description--
|
|
|
|
上一个挑战演示了如何将来自父组件的信息作为 `props` 传递给子组件。 这个挑战着眼于如何将数组作为 `props` 传递。 要将数组传递给 JSX 元素,必须将其视为 JavaScript 并用花括号括起来。
|
|
|
|
```jsx
|
|
<ParentComponent>
|
|
<ChildComponent colors={["green", "blue", "red"]} />
|
|
</ParentComponent>
|
|
```
|
|
|
|
这样,子组件就可以访问数组属性 `colors`。 访问属性时可以使用 `join()` 等数组方法。 `const ChildComponent = (props) => <p>{props.colors.join(', ')}</p>` 这将把所有 `colors` 数组项连接成一个逗号分隔的字符串并生成: `<p>green, blue, red</p>` 稍后,我们将了解在 React 中渲染数组数据的其他常用方法。
|
|
|
|
# --instructions--
|
|
|
|
代码编辑器中有 `List` 和 `ToDo` 组件。 在 `ToDo` 组件中渲染每个 `List` 时,传入 `tasks` 属性并将其分配给待办任务数组,例如 `["walk dog", "workout"]`。 然后访问 `List` 组件中的 `tasks` 数组,在`p`元素中显示其值。 使用 `join(", ")` 把 `props.tasks` 数组作为逗号分隔列表显示在 `p` 元素中。 今天的列表应该至少有 2 个任务,明天的列表应该至少有 3 个任务。
|
|
|
|
# --hints--
|
|
|
|
`ToDo` 组件应该返回单个外部 `div`。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return mockedComponent.children().first().type() === 'div';
|
|
})()
|
|
);
|
|
```
|
|
|
|
`ToDo` 组件的第三个子元素应该是 `List` 组件的一个实例。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return mockedComponent.children().first().childAt(2).name() === 'List';
|
|
})()
|
|
);
|
|
```
|
|
|
|
`ToDo` 组件的第五个子元素应该是 `List` 组件的一个实例。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return mockedComponent.children().first().childAt(4).name() === 'List';
|
|
})()
|
|
);
|
|
```
|
|
|
|
`List` 组件的两个实例都应该具有一个名为 `tasks` 的属性,并且 `tasks` 的类型应该是数组。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return (
|
|
Array.isArray(mockedComponent.find('List').get(0).props.tasks) &&
|
|
Array.isArray(mockedComponent.find('List').get(1).props.tasks)
|
|
);
|
|
})()
|
|
);
|
|
```
|
|
|
|
表示今天任务的第一个 `List` 组件应该有 2 个或更多项。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return mockedComponent.find('List').get(0).props.tasks.length >= 2;
|
|
})()
|
|
);
|
|
```
|
|
|
|
表示明天任务的第二个 `List` 组件应该有 3 个或更多项。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return mockedComponent.find('List').get(1).props.tasks.length >= 3;
|
|
})()
|
|
);
|
|
```
|
|
|
|
`List` 组件应在 `p` 标签中渲染 `tasks` 属性的值。
|
|
|
|
```js
|
|
assert(
|
|
(function () {
|
|
const mockedComponent = Enzyme.mount(React.createElement(ToDo));
|
|
return (
|
|
mockedComponent
|
|
.find('p')
|
|
.get(0)
|
|
.props.children.replace(/\s*,\s*/g, ',') ===
|
|
mockedComponent
|
|
.find('List')
|
|
.get(0)
|
|
.props.tasks.join(',')
|
|
.replace(/\s*,\s*/g, ',') &&
|
|
mockedComponent
|
|
.find('p')
|
|
.get(1)
|
|
.props.children.replace(/\s*,\s*/g, ',') ===
|
|
mockedComponent
|
|
.find('List')
|
|
.get(1)
|
|
.props.tasks.join(',')
|
|
.replace(/\s*,\s*/g, ',')
|
|
);
|
|
})()
|
|
);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --after-user-code--
|
|
|
|
```jsx
|
|
ReactDOM.render(<ToDo />, document.getElementById('root'))
|
|
```
|
|
|
|
## --seed-contents--
|
|
|
|
```jsx
|
|
const List = (props) => {
|
|
{ /* Change code below this line */ }
|
|
return <p>{}</p>
|
|
{ /* Change code above this line */ }
|
|
};
|
|
|
|
class ToDo extends React.Component {
|
|
constructor(props) {
|
|
super(props);
|
|
}
|
|
render() {
|
|
return (
|
|
<div>
|
|
<h1>To Do Lists</h1>
|
|
<h2>Today</h2>
|
|
{ /* Change code below this line */ }
|
|
<List/>
|
|
<h2>Tomorrow</h2>
|
|
<List/>
|
|
{ /* Change code above this line */ }
|
|
</div>
|
|
);
|
|
}
|
|
};
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```jsx
|
|
const List= (props) => {
|
|
return <p>{props.tasks.join(', ')}</p>
|
|
};
|
|
|
|
class ToDo extends React.Component {
|
|
constructor(props) {
|
|
super(props);
|
|
}
|
|
render() {
|
|
return (
|
|
<div>
|
|
<h1>To Do Lists</h1>
|
|
<h2>Today</h2>
|
|
<List tasks={['study', 'exercise']} />
|
|
<h2>Tomorrow</h2>
|
|
<List tasks={['call Sam', 'grocery shopping', 'order tickets']} />
|
|
</div>
|
|
);
|
|
}
|
|
};
|
|
```
|