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let randomNumber = Math.floor(Math.random() * 100) + 1;

const guesses = document.querySelector('.guesses');
const lastResult = document.querySelector('.lastResult');
const lowOrHi = document.querySelector('.lowOrHi');

const guessSubmit = document.querySelector('.guessSubmit');
guessSubmit.addEventListener("click", checkGuess);
const guessField = document.querySelector('.guessField');

let guessCount = 1;
let resetButton;

function checkGuess() {
    let userGuess = Number(guessField.value);
    if (guessCount === 1) {
        guesses.textContent = '上次猜的数：';
    }
    guesses.textContent += userGuess + ' ';

    if (userGuess === randomNumber) {
        lastResult.textContent = '恭喜你！猜对了';
        lastResult.style.backgroundColor = 'green';
        lowOrHi.textContent = '';
        setGameOver();
    } else if (guessCount === 10) {
        lastResult.textContent = '!!!GAME OVER!!!';
        setGameOver();
    } else {
        lastResult.textContent = '你猜错了！';
        lastResult.style.backgroundColor = 'red';
        if (userGuess < randomNumber) {
            lowOrHi.textContent = '你猜低了！';
        } else if (userGuess > randomNumber) {
            lowOrHi.textContent = '你猜高了';
        }
    }

    guessCount++;
    guessField.value = '';
    guessField.focus();
}

function setGameOver() {
    guessField.disabled = true;
    guessSubmit.disabled = true;
    resetButton = document.createElement('button');
    resetButton.textContent = '开始新游戏';
    document.body.appendChild(resetButton);
    resetButton.addEventListener('click', resetGame);
}

function resetGame() {
    guessCount = 1;

    const resetParas = document.querySelectorAll('.resultParas p');
    for (let i = 0; i < resetParas.length; i++) {
        resetParas[i].textContent = '';
    }

    resetButton.parentNode.removeChild(resetButton);

    guessField.disabled = false;
    guessSubmit.disabled = false;
    guessField.value = '';
    guessField.focus();

    lastResult.style.backgroundColor = 'white';

    randomNumber = Math.floor(Math.random() * 100) + 1;
}

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">

    <title>猜数字游戏</title>

    <style>
      html {
        font-family: sans-serif;
      }

      body {
        width: 50%;
        max-width: 800px;
        min-width: 480px;
        margin: 0 auto;
      }

      .lastResult {
        color: white;
        padding: 3px;
      }
    </style>
  </head>

  <body>
    <h1>猜数字游戏</h1>

    <p>我刚才随机选定了一个100以内的自然数。看你能否在 10 次以内猜中它。每次我都会告诉你所猜的结果是高了还是低了。</p>

    <div class="form">
      <label for="guessField">请猜数: </label>
      <input type="text" id="guessField" class="guessField">
      <input type="submit" value="确定" class="guessSubmit">
    </div>

    <div class="resultParas">
      <p class="guesses"></p>
      <p class="lastResult"></p>
      <p class="lowOrHi"></p>
    </div>

  </body>
</html>