小编Rea*_*per的帖子

我试图了解 React useEffect 如何与对象一起工作。

这是一个有助于演示我的问题的示例：

export function UseEffectHook() {
  const initialState = {
    firstName: "Joe",
    lastName: "Smith",
    address: {
      home: "123 street"
    }
  };
  const [user, setUser] = useState(initialState);
  const [count, setCount] = useState(0);

  useEffect(() => {
    console.log("triggered");
  }, [user]);

  return (
    <div>
      <p>useEffect - Practice with different deps</p>
      {JSON.stringify(user)}
      <label>Firstname:</label>

      <input
        type="text"
        onChange={e => setUser({ ...user, firstName: e.target.value })}
      />
      <br />
      <label>Lastname:</label>
      <input
        type="text"
        onChange={e => setUser({ ...user, lastName: e.target.value })}
      />
      <button onClick={() => setCount(count + 1)}>Button</button> …