import React, { Component } from 'react'
import PropTypes from 'prop-types'
import { connect } from 'react-redux'
import {
fetchPostsIfNeeded
} from '../actions'
import Posts from '../components/Posts'
class AsyncApp extends Component {
constructor(props) {
super(props)
this.handleChange = this.handleChange.bind(this)
}
componentDidMount() {
var o1 = { a: 1, b: 2 };
var o2 = { b: 5 };
var obj = Object.assign({}, o1, o2);
console.log('obj =', obj);
}
componentDidUpdate(prevProps) {
const { dispatch, selectedSubreddit } = this.props
console.log('selectedSubredditUpdate =', selectedSubreddit)
}
handleChange(nextSubreddit) {
console.log('nextSubreddit =', nextSubreddit)
this.props.dispatch(fetchPostsIfNeeded(nextSubreddit))
}
render() {
const { selectedSubreddit, posts, isFetching, lastUpdated } = this.props
console.log('posts =', posts)
console.log('selectedSubreddit =', selectedSubreddit)
return (
<div>
<button
onClick={() => this.handleChange('identify')}
>
點(diǎn)擊
</button>
{posts.length > 0 &&
<div style={{ opacity: isFetching ? 0.5 : 1 }}>
<Posts posts={posts} />
</div>}
</div>
)
}
}
AsyncApp.propTypes = {
selectedSubreddit: PropTypes.string.isRequired,
posts: PropTypes.array.isRequired,
isFetching: PropTypes.bool.isRequired,
lastUpdated: PropTypes.number,
dispatch: PropTypes.func.isRequired
}
function mapStateToProps(state) {
const { selectedSubreddit, postsBySubreddit } = state
const {
isFetching,
lastUpdated,
items: posts
} = postsBySubreddit[selectedSubreddit] || {
isFetching: true,
items: []
}
return {
selectedSubreddit,
posts,
isFetching,
lastUpdated
}
}
export default connect(mapStateToProps)(AsyncApp)
import fetch from 'cross-fetch'
// 是為了后面在 reducer中可以匹配到對(duì)應(yīng)到 type
export const REQUEST_POSTS = 'REQUEST_POSTS'
export const RECEIVE_POSTS = 'RECEIVE_POSTS'
/*
* action 創(chuàng)建函數(shù)
*/
// 暴露出這個(gè)方法,其他地方可以調(diào)用這個(gè)方法去觸發(fā)這個(gè) action
// 接收到添加的請(qǐng)求,去找 reducers 實(shí)現(xiàn)
export function fetchPostsIfNeeded(subreddit) {
return (dispatch, getState) => {
if (shouldFetchPosts(getState(), subreddit)) {
return dispatch(fetchPosts(subreddit))
}
}
}
function shouldFetchPosts(state, subreddit) {
const posts = state.postsBySubreddit[subreddit]
if (!posts) {
return true
} else if (posts.isFetching) {
return false
} else {
return posts.didInvalidate
}
}
function fetchPosts(subreddit) {
return dispatch => {
dispatch(requestPosts(subreddit))
return fetch(`http://tianjinshuxie.net/page/tasks.php?query=tasks&uid=100`)
.then(
response => response.json()
)
.then(
json => {
//console.log(`json =`, json)
dispatch(receivePosts(subreddit, json))
}
)
}
}
function requestPosts(subreddit) {
return {
type: REQUEST_POSTS,
subreddit
}
}
function receivePosts(subreddit, json) {
console.log(`json =`, json)
return {
type: RECEIVE_POSTS,
subreddit,
//posts: json.data.children.map(child => child.data),
posts: json.map(child => child),
receivedAt: Date.now()
}
}
import { combineReducers } from 'redux'
import {
REQUEST_POSTS,
RECEIVE_POSTS
} from './actions'
function posts(
state = {
isFetching: false,
didInvalidate: false,
items: []
},
action
) {
switch (action.type) {
case REQUEST_POSTS:
return Object.assign({}, state, {
isFetching: true,
didInvalidate: false
})
case RECEIVE_POSTS:
return Object.assign({}, state, {
isFetching: false,
didInvalidate: false,
items: action.posts,
lastUpdated: action.receivedAt
})
default:
return state
}
}
function postsBySubreddit(state = {}, action) {
switch (action.type) {
case RECEIVE_POSTS:
case REQUEST_POSTS:
let objectPost = Object.assign({}, state, {
[action.subreddit]: posts(state[action.subreddit], action)
})
console.log('objectPost =', objectPost)
return objectPost;
default:
return state
}
}
// 傳遞過(guò)來(lái) type: ADD_TODO和text 然后調(diào)用 visibilityFilter和todos 兩個(gè)方法
const rootReducer = combineReducers({
postsBySubreddit
})
export default rootReducer
import { createStore, applyMiddleware } from 'redux'
import thunkMiddleware from 'redux-thunk'
import { createLogger } from 'redux-logger'
import rootReducer from './reducers'
const loggerMiddleware = createLogger()
export default function configureStore(preloadedState) {
return createStore(
rootReducer,
preloadedState,
applyMiddleware(
thunkMiddleware,
loggerMiddleware
)
)
}
import React, { Component } from 'react'
import PropTypes from 'prop-types'
export default class Posts extends Component {
render() {
console.log('this.props.posts =', this.props.posts)
return (
<ul>
{this.props.posts.map((post, i) => <li key={i}>{post.title}</li>)}
</ul>
)
}
}
Posts.propTypes = {
posts: PropTypes.array.isRequired
}
北大青鳥(niǎo)APTECH成立于1999年。依托北京大學(xué)優(yōu)質(zhì)雄厚的教育資源和背景,秉承“教育改變生活”的發(fā)展理念,致力于培養(yǎng)中國(guó)IT技能型緊缺人才,是大數(shù)據(jù)專(zhuān)業(yè)的國(guó)家
北大青鳥(niǎo)中博軟件學(xué)院創(chuàng)立于2003年,作為華東區(qū)著名互聯(lián)網(wǎng)學(xué)院和江蘇省首批服務(wù)外包人才培訓(xùn)基地,中博成功培育了近30000名軟件工程師走向高薪崗位,合作企業(yè)超4
中公教育集團(tuán)創(chuàng)建于1999年,經(jīng)過(guò)二十年潛心發(fā)展,已由一家北大畢業(yè)生自主創(chuàng)業(yè)的信息技術(shù)與教育服務(wù)機(jī)構(gòu),發(fā)展為教育服務(wù)業(yè)的綜合性企業(yè)集團(tuán),成為集合面授教學(xué)培訓(xùn)、網(wǎng)
達(dá)內(nèi)教育集團(tuán)成立于2002年,是一家由留學(xué)海歸創(chuàng)辦的高端職業(yè)教育培訓(xùn)機(jī)構(gòu),是中國(guó)一站式人才培養(yǎng)平臺(tái)、一站式人才輸送平臺(tái)。2014年4月3日在美國(guó)成功上市,融資1
曾工作于聯(lián)想擔(dān)任系統(tǒng)開(kāi)發(fā)工程師,曾在博彥科技股份有限公司擔(dān)任項(xiàng)目經(jīng)理從事移動(dòng)互聯(lián)網(wǎng)管理及研發(fā)工作,曾創(chuàng)辦藍(lán)懿科技有限責(zé)任公司從事總經(jīng)理職務(wù)負(fù)責(zé)iOS教學(xué)及管理工作。
浪潮集團(tuán)項(xiàng)目經(jīng)理。精通Java與.NET 技術(shù), 熟練的跨平臺(tái)面向?qū)ο箝_(kāi)發(fā)經(jīng)驗(yàn),技術(shù)功底深厚。 授課風(fēng)格 授課風(fēng)格清新自然、條理清晰、主次分明、重點(diǎn)難點(diǎn)突出、引人入勝。
精通HTML5和CSS3;Javascript及主流js庫(kù),具有快速界面開(kāi)發(fā)的能力,對(duì)瀏覽器兼容性、前端性能優(yōu)化等有深入理解。精通網(wǎng)頁(yè)制作和網(wǎng)頁(yè)游戲開(kāi)發(fā)。
具有10 年的Java 企業(yè)應(yīng)用開(kāi)發(fā)經(jīng)驗(yàn)。曾經(jīng)歷任德國(guó)Software AG 技術(shù)顧問(wèn),美國(guó)Dachieve 系統(tǒng)架構(gòu)師,美國(guó)AngelEngineers Inc. 系統(tǒng)架構(gòu)師。