React 點選按鈕顯示div與隐藏div <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>React 點選按鈕顯示div與隐藏div</title>
<script src="https://unpkg.com/[email protected]/umd/react.development.js"></script>
<script src="https://unpkg.com/[email protected]/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/[email protected]/babel.min.js"></script>
<style type="text/css">
.m-test{width: 100px;height: 100px;background-color: red;}
</style>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
class Toggle extends React.Component {
constructor(props) {
super(props);
this.state = {
isToggleOn: true,
dispaly: 'block'
};
// 這個綁定是必要的，使`this`在回調中起作用
this.handleClick = this.handleClick.bind(this);
}
handleClick() {
this.setState(prevState => ({
isToggleOn: !prevState.isToggleOn,
display: prevState.isToggleOn ? 'none': 'block'
}));
}
render() {
return (
<div>
<button onClick={this.handleClick}>
{this.state.isToggleOn ? 'ON' : 'OFF'}
</button>
<div className="m-test" style={{display: this.state.display}}></div>
</div>
);
}
}
ReactDOM.render(
<Toggle />,
document.getElementById('root')
);
</script>
</body>
</html>
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