ReactJS - 02 - ReactJS之入门之00之示例 -

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ReactJS - 02 - ReactJS之入门之00之示例

博客分类：

ReactJS

reactjs

认识一个事物，最直接最感性的认识莫过于直截了当的拿过来看看是什么样子。
二话不说，直接看看 ReactJS DEMO 中的例子吧！

一、官网文档：
https://reactjs.org/tutorial/tutorial.html#completing-the-game

Throughout this tutorial, we touched on React concepts including elements, components, props, and state.

Next 1:
For a more detailed explanation of each of these topics, check out the rest of the documentation.

Next 2:
To learn more about defining components, check out the React.Component API reference.

二、在线运行：
http://www.runoob.com/try/try.php?filename=try_react_component


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>菜鸟教程 React 实例</title>
<script src="https://cdn.bootcss.com/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.bootcss.com/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.bootcss.com/babel-standalone/6.26.0/babel.min.js"></script>
<style>
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;
  box-sizing: border-box;
  display: inline-block;
}

.square:focus {
  outline: none;
}

.kbd-navigation .square:focus {
  background: #ddd;
}

.game {
  display: flex;
  flex-direction: row;
}

.game-info {
  margin-left: 20px;
}

	</style>
	
</head>
<body>

<div id="example"></div>
<script type="text/babel">

function Square(props) {
  return (
	  <span>
			<button className="square" onClick={props.onClick}>
			  {props.value}
			</button>
			<div className="square" onClick={props.onClick}>
			  {props.value}
			</div>
			<i className="square" onClick={props.onClick}>
			  {props.value}
			</i>
			<span className="square" onClick={props.onClick}>
			  {props.value}
			</span>
		</span>
  );
}

class Board extends React.Component {
  
  renderSquare(i) {
    return (
      <Square value={this.props.squares[i]}
              onClick={() => this.props.onClick(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),
      }],
      stepNumber: 0,
      xIsNext: true,
    };
  }
  
 handleClick(i) {
    const history = this.state.history.slice(0, this.state.stepNumber + 1);
    const current = history[history.length - 1];
    const squares = current.squares.slice();
    if (calculateWinner(squares) || squares[i]) {
      return;
    }
    squares[i] = this.state.xIsNext ? 'X' : 'O';
    this.setState({
      history: history.concat([{
        squares: squares,
      }]),
      xIsNext: !this.state.xIsNext,
      stepNumber: history.length
    });
  }
  
 jumpTo(step) {
    this.setState({
      stepNumber: step,
      xIsNext: (step % 2) === 0
    });
  }
  
  render() {
    
    const history = this.state.history;
    const current = history[this.state.stepNumber];
    const winner = calculateWinner(current.squares);

    let status;
    if (winner) {
      status = 'Winner: ' + winner;
    } else {
      status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
    }
    
    
   const moves = history.map((item, indexStep) => {
      const desc = 
                   indexStep ? 
                   'Go to move #' + indexStep : 
                   'Go to game start';
      return (
        <li key={indexStep}>
          <button onClick={() => this.jumpTo(indexStep)}>{desc}</button>
        </li>
      );
    });
    
    return (
      <div className="game">
        <div className="game-board">
          <Board
            squares={current.squares}
            onClick={(i) => this.handleClick(i)}
          />
        </div>
        <div className="game-info">
          <div>{status}</div>
          <ol>{moves}</ol>
        </div>
      </div>
    );
  }
}

// ========================================

ReactDOM.render(
  <Game />,
  document.getElementById('example')
);


 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;
}
</script>

</body>
</html>