umi入门
2019-11-29 本文已影响0人
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花时间学习了umi,算是对自己的学习总结,写了两个简单的demo:计数器和todoList。
1. 搭建项目
通过官网的介绍的脚手架搭建一个简单的项目,选择需要的功能的时候选择antd、dva后面会用到,完成后能在浏览器中 http://localhost:8000/ 看到项目。
2. 修改基础项目结构
- 在 src/pages 目录下新建2个文件夹:
- count/index.jsx
export default function () {
return (
<div>count</div>
)
}
- todoList/index.jsx
export default function () {
return (
<div>todoList</div>
)
}
- 修改 src/pages/index.js 实现首页到这两个新建页面的跳转
import styles from './index.css';
import Link from 'umi/link'
export default function () {
return (
<div className={styles.normal}>
<div><Link to="/count">计数器</Link></div>
<div><Link to="/todoList">todoList</Link></div>
</div>
);
}
现在在首页点击跳转回到404页面,这是因为还没有配置路由,路由配置在根目录下的 .umirc.js,
routes: [
{
path: '/',
component: '../layouts/index',
routes: [
{ path: '/', component: '../pages/index' }
]
}
],
尝试使用umi的约定路由方式,umi 会根据 pages 目录自动生成路由配置,
将.umirc.js的routes配置注释,不注释会以配置文件中的路由配置为主
,现在路由就能正常跳转了。
3. 实现计数器功能
image1. 实现简单的加、减
- 实现基本的页面结构,修改count/index.jsx
import { Button } from 'antd'
import styles from './index.css'
function Count() {
return (
<div>
<h3>数量:1</h3>
<div className={styles.buttons}>
<Button type="primary">加</Button>
{' '}
<Button type="primary">减</Button>
</div>
</div>
)
}
export default Count
- 在count目录下新建model.js文件,用来进行状态数据的管理
export default {
namespace: 'count',
state: {
count: 0
},
reducers: {
increment(state) {
return {
count: state.count + 1
}
},
decrement(state) {
return {
count: state.count - 1
}
}
},
}
- 添加点击事件,实现数字的加、减
count/index.jsx
import { Button } from 'antd'
import styles from './index.css'
import { connect } from 'dva'
function Count({ count, increment, decrement }) {
return (
<div>
<h3>数量:{count}</h3>
<div className={styles.buttons}>
<Button type="primary" onClick={() => { increment() }}>加</Button>
{' '}
<Button type="primary" onClick={() => { decrement() }}>减</Button>
</div>
</div>
)
}
const mapStateToProps = state => {
return {
count: state.count.count
}
}
const mapDispatchToProps = dispatch => {
return {
increment: () => dispatch({ type: 'count/increment' }),
decrement: () => dispatch({ type: 'count/decrement' })
}
}
export default connect(mapStateToProps, mapDispatchToProps)(Count)
完成上述操作,应该能实现简单的加、减功能了。
2. 实现带延迟的加、减
- 在count/model.js中添加异步操作的管理,实现延迟1s加、延迟2s减。
export default {
...
effects: {
*incrementAsync(actions, { put, call }) {
yield call(delay, 1000)
yield put({ type: 'increment' })
},
*decrementAsync(actions, { put, call }) {
yield call(delay, 2000)
yield put({ type: 'decrement' })
}
}
}
function delay(timeout) { // 延迟函数
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve()
}, timeout)
})
}
- 在 count/index.jsx 中添加异步操作
import { Button } from 'antd'
import styles from './index.css'
import { connect } from 'dva'
function Count({ count, increment, decrement, incrementAsync, decrementAsync }) {
return (
<div>
<h3>数量:{count}</h3>
<div className={styles.buttons}>
<Button type="primary" onClick={() => { increment() }}>加</Button>
{' '}
<Button type="primary" onClick={() => { decrement() }}>减</Button>
</div>
<div className={styles.buttons}>
<Button type="primary" onClick={() => { incrementAsync() }}>延迟1s加</Button>
{' '}
<Button type="primary" onClick={() => { decrementAsync() }}>延迟2s减</Button>
</div>
</div>
)
}
const mapStateToProps = state => {
return {
count: state.count.count
}
}
const mapDispatchToProps = dispatch => {
return {
increment: () => dispatch({ type: 'count/increment' }),
decrement: () => dispatch({ type: 'count/decrement' }),
incrementAsync: () => dispatch({ type: 'count/incrementAsync' }),
decrementAsync: () => dispatch({ type: 'count/decrementAsync' })
}
}
export default connect(mapStateToProps, mapDispatchToProps)(Count)
做完以上的步骤一个简单的计数器就基本完成了。
4. 实现一个todoList
image1. 完成静态页面
- 在 todoList 新建componets文件夹用来存放页面组件
components/AddTodo.jsx
import { Input, Button } from 'antd'
import styles from './addTodo.css'
function AddTodo() {
return (
<div className={styles.addDiv}>
<Input placeholder="请输入相关事项" className={styles.input} />
<Button type="primary">添加</Button>
</div>
)
}
export default AddTodo
components/Todo.jsx
import { Typography, Button } from 'antd';
import styles from './todo.css'
const { Text } = Typography;
function Todo() {
return (
<div className={styles.todo}>
<Text className={styles.text}>123</Text>
<div className={styles.buttons}>
<Button type="link">删除</Button>
<Button type="link">修改</Button>
</div>
</div>
)
}
export default Todo
todolist.jsx
import AddTodo from './components/AddTodo'
import Todo from './components/Todo'
import { List } from 'antd'
import styles from './index.css'
function TodoList() {
return (
<div className={styles.todoList}>
<AddTodo></AddTodo>
<List
className={styles.list}
bordered
dataSource={[]}
renderItem={(item) => (
<List.Item>
<Todo ></Todo>
</List.Item>
)}
/>
</div>
)
}
export default TodoList
完成静态页面
image2. 修改AddTodo组件,完成输入框输入,点击添加按钮显示输入的内容
函数组件没有生命周期和state,这里用到了react hook的usestate
import { Input, Button } from 'antd'
import styles from './addTodo.css'
import { useState } from 'react'
function AddTodo() {
const [inputValue, setInputValue] = useState('')
return (
<div className={styles.addDiv}>
<Input placeholder="请输入相关事项" className={styles.input} onChange={(e) => { setInputValue(e.target.value) }} />
<Button type="primary" onClick={() => { console.log(inputValue) }}>添加</Button>
</div>
)
}
export default AddTodo
在input中输入一段文字就能在控制台看到输入的内容了。
3. 新增models进行状态管理
- todoList/models/todoList.js,新建初始state
export default {
namespace: 'todoList',
state: {
list: [
{
content: '123',
completed: false
}
],
}
}
- 在todoList中展示state的内容
import AddTodo from './components/AddTodo'
import Todo from './components/Todo'
import { List } from 'antd'
import { connect } from 'dva'
import styles from './index.css'
function TodoList({ list }) {
return (
<div className={styles.todoList}>
<AddTodo></AddTodo>
<List
className={styles.list}
bordered
dataSource={list}
renderItem={(item) => (
<List.Item>
<Todo {...item}></Todo>
</List.Item>
)}
/>
</div>
)
}
const mapStateToProps = state => {
return {
list: state.todoList.list
}
}
export default connect(mapStateToProps)(TodoList)
修改Todo.js
import { Typography, Button } from 'antd';
import styles from './todo.css'
const { Text } = Typography;
function Todo({ completed, content }) {
return (
<div className={styles.todo}>
<Text className={styles.text} delete={completed}>{content}</Text>
<div className={styles.buttons}>
<Button type="link">删除</Button>
<Button type="link">修改</Button>
</div>
</div>
)
}
export default Todo
4. 完成增、删、改的功能
- 修改 models/todoList.js, 添加reducers
reducers: {
addTodo(state, { payload: value }) { // 增
return {
list: [...state.list, { content: value, completed: false }]
}
},
removeTodo(state, { payload: index }) { // 删
let newList = state.list.filter((item, i) => i !== index)
return {
list: newList
}
},
modifyTodo(state, { payload: index }) { // 改
let newList = state.list.map((item, i) => {
let flag = index === i ? !item.completed : item.completed
return { ...item, completed: flag }
})
return {
list: newList
}
}
},
- 修改AddTodo.jsx实现添加,将先前打印出的输入文字添加到list中来
import { Input, Button } from 'antd'
import styles from './addTodo.css'
import { useState } from 'react'
import { connect } from 'dva'
function AddTodo({ addTodo }) {
const [inputValue, setInputValue] = useState('')
return (
<div className={styles.addDiv}>
<Input placeholder="请输入相关事项" className={styles.input} onChange={(e) => { setInputValue(e.target.value) }} />
<Button type="primary" onClick={() => { addTodo(inputValue) }}>添加</Button>
</div>
)
}
const mapDispatchToProps = dispatch => {
return {
addTodo: value => dispatch({ type: 'todoList/addTodo', payload: value })
}
}
export default connect(null, mapDispatchToProps)(AddTodo)
- 修改 Todo.jsx,实现删除和修改
import { Typography, Button } from 'antd';
import styles from './todo.css'
import { connect } from 'dva'
const { Text } = Typography;
function Todo({ completed, content, index, removeTodo, modifyTodo }) {
return (
<div className={styles.todo}>
<Text className={styles.text} delete={completed}>{content}</Text>
<div className={styles.buttons}>
<Button type="link" onClick={() => { removeTodo(index) }}>删除</Button>
<Button type="link" onClick={() => { modifyTodo(index) }}>修改</Button>
</div>
</div>
)
}
const mapDispatchToProps = dispatch => {
return {
removeTodo: index => dispatch({ type: 'todoList/removeTodo', payload: index }),
modifyTodo: index => dispatch({ type: 'todoList/modifyTodo', payload: index })
}
}
export default connect(null, mapDispatchToProps)(Todo)
- 在 todoList/index.jsx中Todo添加index
<List
className={styles.list}
bordered
dataSource={list}
renderItem={(item, index) => (
<List.Item>
<Todo {...item} index={index}></Todo>
</List.Item>
)}
/>
5. 使用后台数据替换本地list的数据
使用umi-request来向后台发送请求,后台使用easy-mock进行数据模拟
- 安装umi-request
yarn add umi-request
- 请求放在models/todoList中处理
effects: {
*getListAsync(actions, { put, call }) {
const res = yield call(request, 'http://localhost:7300/mock/5dd4fcaebe523217231cce587/react-api/getList')
yield put({ type: 'getList', payload: res.data.list })
}
}
- 修改 todoList/index.jsx, 这里用到了useEffect
import { useEffect } from 'react'
function TodoList({ list, getList }) {
useEffect(() => {
getList()
}, [getList])
......
const mapDisPatchToProps = dispacth => {
return {
getList: () => dispacth({ type: 'todoList/getListAsync' })
}
}
export default connect(mapStateToProps, mapDisPatchToProps)(TodoList)
至此,两个简单的demo基本实现。