React passing params using data-attributes

README.md

使用 DOM API data- 传参

handleClick = (e) => {
  this.setState({
    justClicked: e.target.dataset.letter
});
}


<li key={letter} data-letter={letter} onClick={this.handleClick}>
  {letter}
</li>

FYI: https://reactjs.org/docs/faq-functions.html#example-passing-params-using-data-attributes