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React Pong游戏角色切换移动方向时异常弹跳问题求助

Pong游戏角色移动方向切换时出现指数级弹跳问题

我正在制作一款Pong游戏,使用W/S键控制玩家角色上下移动,但切换移动方向时,角色会出现意外的指数级弹跳现象。

最初代码

import logo from "./logo.svg";
import { useState, useEffect } from "react";
import "./App.css";

function App() {
  const [location, setLocation] = useState(100);

  document.addEventListener("keypress", (e) => handleclick(e));

  const handleclick = (e) => {
    const key = e.key;
    console.log(key);
    if (key == "w") {
      setLocation((prevLocation) => prevLocation - 10);
    }
    if (key == "s") {
      setLocation((prevLocation) => prevLocation + 10);
    }
  };

  //! problem is when you change the direction player bounce 

  return (
    <div className="App">
      <div
        className="player1"
        style={{
          top: location + "px",
        }}
      ></div>
    </div>
  );
}

export default App;

CSS无问题,暂不考虑。

我尝试将setLocation的函数式更新改为直接使用location值更新,但问题依旧,甚至出现无限循环导致应用崩溃——状态虽能正常变更,但事件监听器内的函数会无限执行。之后我将keypress改为keydown事件,还添加了keyup事件来移除keydown监听器,问题仍未解决,修改后的代码如下:

修改后的代码

function App() {
  const [location, setLocation] = useState(100);

  document.addEventListener("keydown", (e) => handleMove(e));

  document.addEventListener("keyup", () => {
    document.removeEventListener("keydown", (e) => handleMove(e));
  });
  console.log(location);

  const handleMove = (e) => {
    const key = e.key;

    if (key == "w") {
      setLocation(location - 10);
    }
    if (key == "s") {
      setLocation(location + 10);
    }
  };

  //! problem is when you change the direction player bounce

  return (
    <div className="App">
      <div
        className="player1"
        style={{
          top: location + "px",
        }}
      ></div>
    </div>
  );
}

export default App;

内容的提问来源于stack exchange,提问作者guardian

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最近更新时间:2026.07.12 21:46:08