正确

练习：

在 useEffect 钩子的第二个参数中需要添加什么才能限制它只在第一次渲染时运行？

import { useState, useEffect } from "react"; import ReactDOM from "react-dom/client"; function App() { const [data, setData] = useState([]); useEffect(() => { setData(getData()) }, []); return <DisplayData data={data} />; } const root = ReactDOM.createRoot(document.getElementById('root')); root.render(<App />);

不正确

点击此处重试

正确

下一题 ❯

import { useState, useEffect } from "react";
import ReactDOM from "react-dom/client";

function App() {
  const [data, setData] = useState([]);

  useEffect(() => {
    setData(getData())
  }, w3exercise_input_no_0
);

  return <DisplayData data={data} />;
}

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);