課程：https://coding.imooc.com/class/chapter/150.html

 

第一章：介紹

 

 

---

 

第二章：知識儲備

React開發環境

1.安裝Nodejs

2.安裝Visual Studio Code

 

安裝create-react-app全域性庫，這是官方開發的一個react腳手架工具

npm install -g create-react-app

 

建立第一個react應用程式

#create-react-app建立一個示例專案
create-react-app react-demo 

經過一段時間的等待，專案已經生成了

 

執行專案

cd react-demo
npm start

 

命令應該會自動開啟瀏覽器，並開啟http://localhost:3000

 

安裝redux

npm install redux --save

 

彈出所有配置檔案，將所有的配置檔案顯示出來，這個過程是不可逆的，會安裝另外一些依賴

npm run eject #彈出自定義配置

 

 

---

 

第三章：react基礎知識回顧 

關於事件呼叫方法時，this的問題，解決方法有三個：

1：在constructor()構造方法中加入程式碼

class Yiying extends Component {
  constructor(props) {
    super(props);
    this.state = {
      solder: ['虎子', '柱子', '王根生']
    }
    //在建構函式加入bind
    this.addSolder = this.addSolder.bind(this);
  }
  addSolder() {
    this.setState({
      solder: [...this
 
.state.solder, '新兵' + Math.random()]
    });
  }

  render() {
    return <div>
      一營營長，{this.props.leader}
      <button onClick={this.addSolder}>新兵入伍</button>
      <ul>
        {this.state.solder.map(v => {
          return <li key={v}>{v}</li>
        })}
      </ul>
    </div>
  }
}

View Code

2：在rander方法中，使用箭頭函式呼叫方法

class Yiying extends Component {
  constructor(props) {
    super(props);
    this.state = {
      solder: ['虎子', '柱子', '王根生']
    }
  }
  addSolder() {
    this.setState({
      solder: [...this.state.solder, '新兵' + Math.random()]
    });
  }

  render() {
    return <div>
      一營營長，{this.props.leader}
      {/*在呼叫方法時加入箭頭函式*/}
      <button onClick={() => this.addSolder()}>新兵入伍</button>
      <ul>
        {this.state.solder.map(v => {
          return <li key={v}>{v}</li>
        })}
      </ul>
    </div>
  }
}

View Code

3：將方法函式修改為箭頭函式

class Yiying extends Component {
  constructor(props) {
    super(props);
    this.state = {
      solder: ['虎子', '柱子', '王根生']
    }
  }
  //修改方法為箭頭函式
  addSolder = () => {
    this.setState({
      solder: [...this.state.solder, '新兵' + Math.random()]
    });
  }

  render() {
    return <div>
      一營營長，{this.props.leader}
      <button onClick={this.addSolder}>新兵入伍</button>
      <ul>
        {this.state.solder.map(v => {
          return <li key={v}>{v}</li>
        })}
      </ul>
    </div>
  }
}

View Code

 

react生命週期

class App extends Component {  
  componentWillMount() {
    console.log('====================================');
    console.log('將要載入');
    console.log('====================================');
  }
  
  componentDidMount() {
    console.log('====================================');
    console.log('已經載入');
    console.log('====================================');
  }
  render() {
    const boss = '李雲龍';
    console.log('====================================');
    console.log('正在載入');
    console.log('====================================');
    return (
      <div>
        獨立團，團長{boss}
        <Yiying leader='張大喵'></Yiying>
        <Qibinglian leader='孫德勝'></Qibinglian>
      </div>
    );
  }
}

View Code

 

在react的元件，如果是普通的元件，則會繼承至react.Component

class Yiying extends Component {
  constructor(props) {
    super(props);
    this.state = {
      solder: ['虎子', '柱子', '王根生']
    }
  }
  //修改方法為箭頭函式
  addSolder = () => {
    this.setState({
      solder: [...this.state.solder, '新兵' + Math.random()]
    });
  }

  render() {
    return <div>
      一營營長，{this.props.leader}
      <Button onClick={this.addSolder} type='primary'>新兵入伍</Button>
      <List renderHeader={() => '士兵列表'}>
        {this.state.solder.map(v => {
          return <Item key={v}>{v}</Item>
        })}
      </List>
    </div>
  }
}

View Code

如果該元件只有rander方法，不需要其他任何的事件等，可以使用以下寫法，也是可以的

function Qibinglian(props) {
  return <div>騎兵連連長{props.leader}</div>
}

呼叫時，直接使用同樣的方式

class App extends Component {
  render() {
    const boss = '李雲龍';
    return (
      <div>
        獨立團，團長{boss}
        <Yiying leader='張大喵'></Yiying>
        <Qibinglian leader='孫德勝'></Qibinglian>//該元件只顯示，不做其他事件等響應
      </div>
    );
  }
}

 

antd-mobile引用

npm install antd-mobile --save

//引用元件
import {Button} from 'antd-mobile';

//引用樣式
import 'antd-mobile/dist/antd-mobile.css';

//元件
<Button onClick={this.addSolder} type='primary'>新兵入伍</Button>

 

如果想按需載入antd-mobile樣式，可以在執行過npm run ejest後，安裝一個外掛

npm install babel-plugin-import --save-dev

 

生成的package.json中找到babel節點，修改為下內容

  "babel": {
    "presets": [
      "react-app"
    ],
    "plugins":[
      ["import", { "libraryName": "antd-mobile", "style": "css" }]
    ]
  }, 

這時，react元件中，就不再需要引用antd-mobile的css了

程式碼是為以下

import React, { Component } from 'react';
import { Button, List } from 'antd-mobile';

const Item = List.Item;

class App extends Component {
  render() {
    const boss = '李雲龍';
    return (
      <div>
        獨立團，團長{boss}
        <Yiying leader='張大喵'></Yiying>
        <Qibinglian leader='孫德勝'></Qibinglian>
      </div>
    );
  }
}

function Qibinglian(props) {
  return <div>騎兵連連長{props.leader}</div>
}

class Yiying extends Component {
  constructor(props) {
    super(props);
    this.state = {
      solder: ['虎子', '柱子', '王根生']
    }
  }
  //修改方法為箭頭函式
  addSolder = () => {
    this.setState({
      solder: [...this.state.solder, '新兵' + Math.random()]
    });
  }

  render() {
    return <div>
      一營營長，{this.props.leader}
      <Button onClick={this.addSolder} type='primary'>新兵入伍</Button>
      <List renderHeader={() => '士兵列表'}>
        {this.state.solder.map(v => {
          return <Item key={v}>{v}</Item>
        })}
      </List>
    </div>
  }
}

export default App;

App.js

{
  "name": "react-demo",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "antd-mobile": "^2.1.3",
    "autoprefixer": "7.1.6",
    "babel-core": "6.26.0",
    "babel-eslint": "7.2.3",
    "babel-jest": "20.0.3",
    "babel-loader": "7.1.2",
    "babel-preset-react-app": "^3.1.0",
    "babel-runtime": "6.26.0",
    "case-sensitive-paths-webpack-plugin": "2.1.1",
    "chalk": "1.1.3",
    "css-loader": "0.28.7",
    "dotenv": "4.0.0",
    "eslint": "4.10.0",
    "eslint-config-react-app": "^2.0.1",
    "eslint-loader": "1.9.0",
    "eslint-plugin-flowtype": "2.39.1",
    "eslint-plugin-import": "2.8.0",
    "eslint-plugin-jsx-a11y": "5.1.1",
    "eslint-plugin-react": "7.4.0",
    "extract-text-webpack-plugin": "3.0.2",
    "file-loader": "1.1.5",
    "fs-extra": "3.0.1",
    "html-webpack-plugin": "2.29.0",
    "jest": "20.0.4",
    "object-assign": "4.1.1",
    "postcss-flexbugs-fixes": "3.2.0",
    "postcss-loader": "2.0.8",
    "promise": "8.0.1",
    "raf": "3.4.0",
    "react": "^16.2.0",
    "react-dev-utils": "^4.2.1",
    "react-dom": "^16.2.0",
    "redux": "^3.7.2",
    "style-loader": "0.19.0",
    "sw-precache-webpack-plugin": "0.11.4",
    "url-loader": "0.6.2",
    "webpack": "3.8.1",
    "webpack-dev-server": "2.9.4",
    "webpack-manifest-plugin": "1.3.2",
    "whatwg-fetch": "2.0.3"
  },
  "scripts": {
    "start": "node scripts/start.js",
    "build": "node scripts/build.js",
    "test": "node scripts/test.js --env=jsdom"
  },
  "jest": {
    "collectCoverageFrom": [
      "src/**/*.{js,jsx,mjs}"
    ],
    "setupFiles": [
      "<rootDir>/config/polyfills.js"
    ],
    "testMatch": [
      "<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}",
      "<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}"
    ],
    "testEnvironment": "node",
    "testURL": "http://localhost",
    "transform": {
      "^.+\\.(js|jsx|mjs)$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
      "^(?!.*\\.(js|jsx|mjs|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"
    ],
    "moduleNameMapper": {
      "^react-native$": "react-native-web"
    },
    "moduleFileExtensions": [
      "web.js",
      "mjs",
      "js",
      "json",
      "web.jsx",
      "jsx",
      "node"
    ]
  },
  "babel": {
    "presets": [
      "react-app"
    ],
    "plugins": [
      [
        "import",
        {
          "libraryName": "antd-mobile",
          "style": "css"
        }
      ]
    ]
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "devDependencies": {
    "babel-plugin-import": "^1.6.3"
  }
}

package.json

 

 

 

 

 

---

 

第四章：redux基礎

 

 

---

 

React的預設方法

 

 

未完待續