之所以显示false，是因为bioData[0].id是一个数字，但从input_id.value得到的是一个字符串。输入元素总是返回一个字符串，即使是type="number"。type属性只是为了方便输入，它不会以任何方式解析数据。从input获取值时使用parseInt()，或者更改Initial_data以包含字符串形式的id。

//Filename: App.js

import { useState, useRef } from "react";

export default function App() {
  const bioData = [{ id: 1, name: "harry", score: 12 }];
  const [myArray, setMyArray] = useState(bioData);
  const [sid, setId] = useState();
  const nameInput = useRef();
  const scoreInput = useRef();

  const handleId = (e) => {
//parseInt(value, radix)
//for decimal number system, radix is 10 
    setId(parseInt(e.target.value, 10));
  };

  const updateArray = () => {
    const new_data = {
      id: sid,
      name: nameInput.current.value,
      score: scoreInput.current.value
    };

    const isFound = myArray.some((el) => {
      return el.id === new_data.id;
    });

    if (isFound) {
      console.log("✅ array contains object with id:", new_data.id);
      return;
    }
    setMyArray([...myArray, new_data]);
    console.log("updated");
  };

  return (
    <form>
      <input
        ref={nameInput}
        type="number"
        placeholder="Enter Id"
        onChange={(e) => handleId(e)}
        required
      />
      <input ref={scoreInput} type="text" placeholder="Enter Name" required />
      <input
        id="input-score"
        type="number"
        placeholder="Enter Score"
        required
      />
      <button
        type="submit"
        onClick={(e) => {
          e.preventDefault();
          updateArray();
        }}
      >
        submit
      </button>
    </form>
  );
}

为此，您应该编写给定的代码

const isFound = myArray.some(el => el._id === sid);

而不是

const isFound = myArray.some(el => el.id === sid);

因为mongodb有as _id元素的id。