2018-10-10 18:03:03 -04:00
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---
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id: 5a24c314108439a4d4036155
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title: Send Action Data to the Store
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challengeType: 6
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isRequired: false
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2020-09-07 16:16:17 +08:00
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forumTopicId: 301448
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localeTitle: 发送 Action Data 给 Store
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2018-10-10 18:03:03 -04:00
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---
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## Description
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2020-09-07 16:16:17 +08:00
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<section id='description'>
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到目前为止,你已经学会了如何将 action dispatch 给 Redux store,但到目前为止,这些 action 并未包含除 <code>type</code>之外的任何信息。你还可以发送特定数据和 action 一起。事实上,这是非常常见的,因为 action 通常源于一些用户交互,并且往往会携带一些数据,Redux store 经常需要知道这些数据。
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</section>
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2018-10-10 18:03:03 -04:00
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## Instructions
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2020-09-07 16:16:17 +08:00
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<section id='instructions'>
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在代码编辑器中定义了一个基础的<code>notesReducer()</code>和<code>addNoteText()</code> action creator。完成<code>addNoteText()</code>函数的主体,这样它就会返回一个<code>action</code>对象。该对象应该包含一个<code>type</code>属性,其值为<code>ADD_NOTE</code>,还有一个<code>text</code>属性通过 action creator 将值设置为<code>note</code>。当你调用 action creator 时,你需要传入可以访问该对象的特定注释信息。
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接下来,完成在<code>notesReducer()</code>中编写的<code>switch</code>语句。你需要添加一个处理<code>addNoteText()</code>操作的选项。只要存在<code>ADD_NOTE</code>类型的 action,就应该触发 case,并且它应该在传入的<code>action</code>上返回<code>text</code>属性作为新的<code>state</code>
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这个 action 将在代码底部发送。一旦完成后,运行代码并观察控制台。这就是将特定于 action 的数据发送到 store 并在更新 store <code>state</code>时使用它所需的全部内容。
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</section>
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2018-10-10 18:03:03 -04:00
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## Tests
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<section id='tests'>
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```yml
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tests:
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2020-09-07 16:16:17 +08:00
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- text: action creator <code>addNoteText</code>应该返回一个包含<code>type</code>和<code>text</code>的对象。
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2020-02-18 01:40:55 +09:00
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testString: assert((function() { const addNoteFn = addNoteText('__TEST__NOTE'); return addNoteFn.type === ADD_NOTE && addNoteFn.text === '__TEST__NOTE' })());
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2020-09-07 16:16:17 +08:00
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- text: dispatch 一个 action creator 是<code>addNoteText</code>的action<code>ADD_NOTE</code>,应将<code>state</code>更新为 action creator 传递的字符串。
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2020-02-18 01:40:55 +09:00
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testString: assert((function() { const initialState = store.getState(); store.dispatch(addNoteText('__TEST__NOTE')); const newState = store.getState(); return initialState !== newState && newState === '__TEST__NOTE' })());
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2018-10-10 18:03:03 -04:00
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='jsx-seed'>
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```jsx
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const ADD_NOTE = 'ADD_NOTE';
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const notesReducer = (state = 'Initial State', action) => {
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switch(action.type) {
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2020-09-07 16:16:17 +08:00
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// 修改此行下方的代码
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2018-10-10 18:03:03 -04:00
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2020-09-07 16:16:17 +08:00
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// 修改此行上方的代码
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2018-10-10 18:03:03 -04:00
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default:
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return state;
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}
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};
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const addNoteText = (note) => {
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2020-09-07 16:16:17 +08:00
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// 修改此行下方的代码
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2018-10-10 18:03:03 -04:00
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2020-09-07 16:16:17 +08:00
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// 修改此行上方的代码
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2018-10-10 18:03:03 -04:00
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};
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const store = Redux.createStore(notesReducer);
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console.log(store.getState());
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store.dispatch(addNoteText('Hello!'));
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console.log(store.getState());
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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2020-09-07 16:16:17 +08:00
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const ADD_NOTE = 'ADD_NOTE';
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const notesReducer = (state = 'Initial State', action) => {
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switch(action.type) {
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// change code below this line
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case ADD_NOTE:
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return action.text;
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// change code above this line
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default:
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return state;
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}
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};
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const addNoteText = (note) => {
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// change code below this line
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return {
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type: ADD_NOTE,
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text: note
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}
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// change code above this line
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};
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const store = Redux.createStore(notesReducer);
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console.log(store.getState());
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store.dispatch(addNoteText('Hello Redux!'));
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console.log(store.getState());
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2018-10-10 18:03:03 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2020-09-07 16:16:17 +08:00
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</section>
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