React.StrictMode下会渲染两次

import { useState } from "react";
import "./styles.css";

export default function App() {
  const [count, setCount] = useState(0);
  const promise = Promise.resolve("hello");
  console.log(promise);
  promise.then((c) => console.log(c));
  return (
    <div className="App">
      <h1 onClick={() => setCount(count + 1)}>count: {count}</h1>
    </div>
  );
}

import { StrictMode } from "react";
import ReactDOM from "react-dom";

import App from "./App";

const rootElement = document.getElementById("root");
ReactDOM.render(
  <StrictMode>
    <App />
  </StrictMode>,
  rootElement
);