摘要：根據頁面中中的例子匯總修改而成。代碼代碼流逝時間計時器按鈕點擊計數流逝時間計時器寫法實時求解一元二次方程調用組件制作動畫效果代碼僅在例中使用

根據http://reactjs.cn/react/docs/...頁面中Starter Kit 15.3.1中的例子匯總修改而成。

HTML代碼

JS代碼

const container1 = document.getElementById("container1")
const container2 = document.getElementById("container2")
const container3 = document.getElementById("container3")
const container4 = document.getElementById("container4")
const container5 = document.getElementById("container5")
const container6 = document.getElementById("container6")


//1 "Hello" + name
function Welcome(props) {
    return 
 Hello, { props.name } < /h1>;
}

const element = < Welcome name = "Diary" / > ;
ReactDOM.render(
    element,
    container1
);

//2 流逝時間計時器
var Elapsed = React.createClass({
    render: function () {
        var elapsed = Math.round(this.props.elapsed / 100);
        var seconds = elapsed / 10 + (elapsed % 10 ? "" : ".0");
        var message =
            "React has been successfully running for " + seconds + " seconds.";

        return 
 { message } < /p>;
    }
});

var start = new Date().getTime();
setInterval(function () {
    ReactDOM.render( < Elapsed elapsed = { new Date().getTime() - start }
        / > ,
        container2
    );
}, 50);

//3 按鈕點擊計數

var Counter = React.createClass({
    getInitialState: function () {
        return { 
            count: 2,
            sum: 100
        };
    },
    handleClick: function () {
        this.setState({
            count: this.state.count * this.state.count,
        });
    },
    handleDoubleClick: function () {
        this.setState({
            count: 2,
            sum: 1000
        })
    },
    render: function () {
        return ( 
            < button onClick = { this.handleClick } onDoubleClick = { this.handleDoubleClick }>
            sum - count: { this.state.sum - this.state.count } < /button>
        );
    }
});
ReactDOM.render( < Counter / > ,
    container3
);


//4 流逝時間計時器（ES6寫法）

class ExampleApplication extends React.Component {
    render() {
        var elapsed = Math.round(this.props.elapsed / 100);
        var seconds = elapsed / 10 + (elapsed % 10 ? "" : ".0");
        var message =
            `React has been successfully running for ${seconds} seconds.`;

        return 
 { message } < /p>;
    }
}
var start = new Date().getTime();
setInterval(() => {
    ReactDOM.render( < ExampleApplication elapsed = { new Date().getTime() - start }/>,
        container4
    );
}, 50);


//5 實時求解一元二次方程

var QuadraticCalculator = React.createClass({
  getInitialState: function() {
    return {
      a: 1,
      b: 3,
      c: -4
    };
  },

  /**
   * This function will be re-bound in render multiple times. Each .bind() will
   * create a new function that calls this with the appropriate key as well as
   * the event. The key is the key in the state object that the value should be
   * mapped from.
   */
  handleInputChange: function(key, event) {
    var partialState = {};
    partialState[key] = parseFloat(event.target.value);
    this.setState(partialState);
  },

  render: function() {
    var a = this.state.a;
    var b = this.state.b;
    var c = this.state.c;
    var root = Math.sqrt(Math.pow(b, 2) - 4 * a * c);
    var denominator = 2 * a;
    var x1 = (-b + root) / denominator;
    var x2 = (-b - root) / denominator;
    return (
      

        
          ax2 + bx + c = 0
        
        
Solve for x:
        

          
            a: 
          
          

          
            b: 
          
          

          
            c: 
          
          

          x: {x1}, {x2}
        
      
    );
  }
});

ReactDOM.render(
  ,
  container5
);


//6 調用React組件CSSTransitionGroup制作動畫效果

var CSSTransitionGroup = React.addons.CSSTransitionGroup;
var INTERVAL = 2000;

var AnimateDemo = React.createClass({
getInitialState: function() {
  return {current: 0};
},

componentDidMount: function() {
  this.interval = setInterval(this.tick, INTERVAL);
},

componentWillUnmount: function() {
  clearInterval(this.interval);
},

tick: function() {
  this.setState({current: this.state.current + 1});
},

render: function() {
  var children = [];
  var colors = ["#fac", "#cdc", "#36d", "#ca0", "#0aa"];
  for (var i = this.state.current, pos=0; i < this.state.current + colors.length; i++, pos++) {
    var style = {
      left: pos * 128,
      background: colors[i % colors.length]
    };
    children.push(
{i}
);
  }
  return (
    
      {children}
    
  );
}
});

ReactDOM.render(
,
container6
);

CSS代碼（僅在例6中使用）

.example-enter,
.example-leave {
  -webkit-transition: all .25s;
  transition: all .25s;
}

.example-enter,
.example-leave.example-leave-active {
  opacity: 0.01;
}

.example-leave.example-leave-active {
  margin-left: -128px;
}

.example-enter {
  margin-left: 128px;
}

.example-enter.example-enter-active,
.example-leave {
  margin-left: 0;
  opacity: 1;
}

.animateExample {
  display: block;
  height: 128px;
  position: relative;
  width: 384px;
}

.animateItem {
  color: white;
  font-size: 36px;
  font-weight: bold;
  height: 128px;
  line-height: 128px;
  position: absolute;
  text-align: center;
  -webkit-transition: all .25s; /* TODO: make this a move animation */
  transition: all .25s; /* TODO: make this a move animation */
  width: 128px;
}