下面是获取选择的代码段

export default function App() {
  const [text, setText] = useState("");
  function getSelectedText() {
    let selectedText = window.getSelection().toString()
    setText(selectedText);
  }
  return (
    <div className="App">
      <p>this is a piece of text that can be seleted partially</p>
      <button onMouseDown={getSelectedText}>select</button>
      <h3>{text}</h3>
    </div>
  );
}