语法

代替 useMemo

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一、缓存实例,确保实例只创建一次

import { useCreation, useUpdate } from "ahooks";

class Person {
  constructor() {
    console.log("Person");
    this.num = Math.random();
  }
}

function App() {
  const person = useCreation(() => new Person(), []);
  const update = useUpdate();

  return (
    <div>
      <h3>useUpdate</h3>
      {person.num}
      <button onClick={update}>刷新</button>
    </div>
  );
}

export default App;

代替 useRef

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