[更新]简单的官方demo井字棋

src/index.js

@@ -1,17 +1,139 @@
+/**
+ *  Web唐明明
+ *  匆匆数载恍如梦，岁月迢迢华发增。
+ *  碌碌无为枉半生，一朝惊醒万事空。
+ *  ComponentName: '官方demo - 组件之间的传参'
+ */
+
 import React from 'react';
 import ReactDOM from 'react-dom';
 import './index.css';
-import App from './App';
-import reportWebVitals from './reportWebVitals';
+
+// 类组件
+// class Square extends React.Component {
+//   // 入口函数
+//   render() {
+//     return (
+//       <button
+//         className="square"
+//         onClick={() => this.props.onSquare()}
+//       >
+//         {this.props.value}
+//       </button>
+//     );
+//   }
+// }
+
+// 函数组件
+const Square = (props) => {
+  return (
+    <button
+      className="square"
+      onClick={props.onSquare}
+    >
+      {props.value}
+    </button>
+  )
+}
+
+class Board extends React.Component {
+  // 类组件es6的constructor钩子函数
+  constructor (props) {
+    super(props);
+    this.state = {
+      squares: Array(9).fill(null),
+      xInNext: true
+    }
+  }
+  // 定一个一个组件方法
+  handleClick(i) {
+    // Array.slice()返回数组选定的元素,相当于克隆了原有数组
+    const squares = this.state.squares.slice()
+    if(calculateWinner(squares) || squares[i]) {
+      return
+    }
+    squares[i] = this.state.xInNext ? 'X': 'O'
+    this.setState({
+      squares,
+      xInNext: !this.state.xInNext
+    })
+  }
+  // 小方格方法
+  renderSquare(i) {
+    return <Square
+      value={this.state.squares[i]}
+      onSquare={()=>this.handleClick(i)}
+    />;
+  }
+  render() {
+    const winner = calculateWinner(this.state.squares)
+    let status;
+    if (winner) {
+      status = '恭喜选手' + winner + '获胜~'
+    }else{
+      status = '下一位选手: ' + (this.state.xInNext ? 'X': 'O');
+    }
+    return (
+      <div>
+        <div className="status">{status}</div>
+        <div className="board-row">
+          {this.renderSquare(0)}
+          {this.renderSquare(1)}
+          {this.renderSquare(2)}
+        </div>
+        <div className="board-row">
+          {this.renderSquare(3)}
+          {this.renderSquare(4)}
+          {this.renderSquare(5)}
+        </div>
+        <div className="board-row">
+          {this.renderSquare(6)}
+          {this.renderSquare(7)}
+          {this.renderSquare(8)}
+        </div>
+      </div>
+    );
+  }
+}
+
+class Game extends React.Component {
+  render() {
+    return (
+      <div className="game">
+        <div className="game-board">
+          <Board />
+        </div>
+        <div className="game-info">
+          <div>{/* status */}</div>
+          <ol>{/* TODO */}</ol>
+        </div>
+      </div>
+    );
+  }
+}
+
+function calculateWinner(squares) {
+  const lines = [
+    [0, 1, 2],
+    [3, 4, 5],
+    [6, 7, 8],
+    [0, 3, 6],
+    [1, 4, 7],
+    [2, 5, 8],
+    [0, 4, 8],
+    [2, 4, 6],
+  ];
+  for (let i = 0; i < lines.length; i++) {
+    const [a, b, c] = lines[i];
+    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
+      return squares[a];
+    }
+  }
+  return null;
+}
 
 ReactDOM.render(
-  <React.StrictMode>
-    <App />
-  </React.StrictMode>,
+  <Game />,
   document.getElementById('root')
 );
 
-// If you want to start measuring performance in your app, pass a function
-// to log results (for example: reportWebVitals(console.log))
-// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
-reportWebVitals();