[新增]简单的仿头条网站开始

井字格demo/index.css

@@ -0,0 +1,58 @@
+
+/**
+ *  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。
+ */
+
+body {
+    font: 14px "Century Gothic", Futura, sans-serif;
+    margin: 20px;
+}
+
+ol, ul {
+    padding-left: 30px;
+}
+
+.board-row:after {
+    clear: both;
+    content: "";
+    display: table;
+}
+
+.status {
+    margin-bottom: 10px;
+}
+
+.square {
+    background: #fff;
+    border: 1px solid #999;
+    float: left;
+    font-size: 24px;
+    font-weight: bold;
+    line-height: 34px;
+    height: 34px;
+    margin-right: -1px;
+    margin-top: -1px;
+    padding: 0;
+    text-align: center;
+    width: 34px;
+}
+
+.square:focus {
+    outline: none;
+}
+
+.kbd-navigation .square:focus {
+    background: #ddd;
+}
+
+.game {
+    display: flex;
+    flex-direction: row;
+}
+
+.game-info {
+    margin-left: 20px;
+}
+

井字格demo/index.js

@@ -0,0 +1,162 @@
+/**
+ *  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';
+
+// 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 {
+  // 小方格方法
+  renderSquare(i) {
+    return <Square
+      value={this.props.squares[i]}
+      onSquare={()=>this.props.onBoard(i)}
+    />;
+  }
+  render() {
+    return (
+      <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 {
+  constructor (props) {
+    super(props)
+    this.state = {
+      history: [{
+        squares: Array(9).fill(null)
+      }],
+      xIsNext: true,
+      stepIndex: 0
+    }
+  }
+  // 定一个一个组件方法
+  handleClick(i) {
+    const history = this.state.history.slice(0, this.state.stepIndex + 1)
+    const current = history[history.length - 1]
+    const squares = current.squares.slice()
+    if(calculateWinner(squares) || squares[i]){
+      return
+    }
+    squares[i] = this.state.xInNext ? 'X': 'O'
+    this.setState({
+      history: history.concat([{ squares }]),
+      xInNext: !this.state.xInNext,
+      stepIndex: history.length
+    })
+    // Array.slice()返回数组选定的元素,相当于克隆了原有数组
+  }
+  jumpTo(index){
+    this.setState({
+      stepIndex: index,
+      xIsNext: (index % 2) === 0,
+    })
+  }
+  render() {
+    const history = this.state.history
+    const current = history[this.state.stepIndex]
+    const winner = calculateWinner(current.squares)
+    const moves = history.map((stepArr, index) => {
+      const desc = index ? '下一步' + index : '开始游戏'
+      return(
+        <li key={index}>
+          <button onClick={()=> this.jumpTo(index)}>{desc}</button>
+        </li>
+      )
+    })
+    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 className="game">
+        <div className="game-board">
+          <Board
+            squares={current.squares}
+            onBoard={(i) => this.handleClick(i)}
+          />
+        </div>
+        <div className="game-info">
+          <div>{status}</div>
+          <ol>{moves}</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(
+  <Game />,
+  document.getElementById('root')
+);
+