React显示条件

function App() {
  const isLoggedIn = true;
  
  return (
    <div>
      {isLoggedIn ? <LoggedinComponent /> : <LoginComponent />}
    </div>
  );
}

function App() {
  const isLoggedIn = true;
  
  return (
    <div>
      {isLoggedIn && <LoggedinComponent />}
    </div>
  );
}

function App() {
  const isLoggedIn = true;
  let componentToRender;
  
  if (isLoggedIn) {
    componentToRender = <LoggedinComponent />;
  } else {
    componentToRender = <LoginComponent />;
  }
  
  return (
    <div>
      {componentToRender}
    </div>
  );
}