react组件懒加载

const Alert = lazy(() => import(‘./components/alert‘));
export default function App(props) {
    return (
    <div className="App">
        <Suspense fallback="正在加载中...">
          <Alert/>
        </Suspense>
    </div>
  );
}

{
  loader: ‘bundle-loader‘,
  options: {
    lazy: true
  }
}

var waitForChunk = require("bundle-loader!./file.js");

// To wait until the chunk is available (and get the exports)
//  you need to async wait for it.
waitForChunk(function(file) {
    // use file like it was required with
    // var file = require("./file.js");
});