Created
August 7, 2020 12:29
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フィボナッチ数列を計算するReactコンポーネント
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>Fibonacci</title> | |
| <script src="https://unpkg.com/react@16/umd/react.development.js"></script> | |
| <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script> | |
| <script src="https://unpkg.com/[email protected]/babel.js"></script> | |
| </head> | |
| <body> | |
| <div id="root">wait...</div> | |
| <script type="text/babel"> | |
| // State をクリックで更新する | |
| class Fibonacci extends React.Component { | |
| constructor(props) { | |
| super(props); | |
| this.state = { | |
| num1: 1, | |
| num2: 1, | |
| msg: "Fibonacci: 1, 1" | |
| }; | |
| this.calcNext = this.calcNext.bind(this); | |
| } | |
| calcNext(e) { | |
| this.setState( | |
| (state) => { | |
| return { | |
| num2: state.num1, | |
| num1: state.num1 + state.num2, | |
| msg: state.msg + ", " + (state.num1 + state.num2) | |
| } | |
| } | |
| ) | |
| } | |
| render() { | |
| return <div> | |
| <p>{this.state.msg}</p> | |
| <button onClick={this.calcNext}>Calc</button> | |
| </div>; | |
| } | |
| } | |
| ReactDOM.render(<Fibonacci />, document.getElementById('root')); | |
| </script> | |
| </body> | |
| </html> |
Author
kuredev
commented
Aug 7, 2020
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