依据http://reactjs.cn/react/docs/…页面中Starter Kit 15.3.1中的例子汇总修正而成。
HTML代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>React test</title>
<link rel="stylesheet" href="react_transition.css">
<script src="lib/react-with-addons.js"></script>
<script src="lib/react-dom.js"></script>
<script src="lib/browser.min.js"></script>
</head>
<body>
<div id="container1"></div>
<div id="container2"></div>
<div id="container3"></div>
<div id="container4"></div>
<div id="container5"></div>
<div id="container6"></div>
<div id="container7"></div>
<div id="container8"></div>
<div id="container9"></div>
<div id="container10"></div>
<script src="react_test.js" type="text/babel"></script>
</body>
</html>
JS代码
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 <h1 > Hello, { props.name } < /h1>;
}
const element = < Welcome name = "Diary" / > ;
ReactDOM.render(
element,
container1
);
//2 流逝时候计时器
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 <p > { message } < /p>;
}
});
var start = new Date().getTime();
setInterval(function () {
ReactDOM.render( < Elapsed elapsed = { new Date().getTime() - start }
/ > ,
container2
);
}, 50);
//3 按钮点击计数
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 流逝时候计时器（ES6写法）
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 <p > { message } < /p>;
}
}
var start = new Date().getTime();
setInterval(() => {
ReactDOM.render( < ExampleApplication elapsed = { new Date().getTime() - start }/>,
container4
);
}, 50);
//5 及时求解一元二次方程
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 (
<div>
<strong>
<em>ax</em><sup>2</sup> + <em>bx</em> + <em>c</em> = 0
</strong>
<h4>Solve for <em>x</em>:</h4>
<p>
<label>
a: <input type="number" value={a} onChange={this.handleInputChange.bind(null, 'a')} />
</label>
<br />
<label>
b: <input type="number" value={b} onChange={this.handleInputChange.bind(null, 'b')} />
</label>
<br />
<label>
c: <input type="number" value={c} onChange={this.handleInputChange.bind(null, 'c')} />
</label>
<br />
x: <strong>{x1}, {x2}</strong>
</p>
</div>
);
}
});
ReactDOM.render(
<QuadraticCalculator />,
container5
);
//6 挪用React组件CSSTransitionGroup制造动画结果
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(<div key={i} className="animateItem" style={style}>{i}</div>);
}
return (
<CSSTransitionGroup
className="animateExample"
transitionEnterTimeout={250}
transitionLeaveTimeout={250}
transitionName="example">
{children}
</CSSTransitionGroup>
);
}
});
ReactDOM.render(
<AnimateDemo />,
container6
);CSS代码（仅在例6中运用）
.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;
}
