基于JavaScript實現(xiàn)猜數(shù)字游戲代碼實例

更新時間：2020年07月30日 10:22:33 作者：波爾

這篇文章主要介紹了基于JavaScript實現(xiàn)猜數(shù)字游戲代碼實例,文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下

環(huán)境

vscode 1.46
Microsoft Edge 83

示例

以下內(nèi)容為了解和熟悉 JavaScript，不需要理解，能夠復(fù)制粘貼并正確運行即可。

新建網(wǎng)頁模板

在 vscode 中新建一個 index.html 文件，然后輸入以下內(nèi)容。

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

  <title>猜數(shù)字游戲</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>猜數(shù)字游戲</h1>

  <p>我剛才隨機選定了一個100以內(nèi)的自然數(shù)?？茨隳芊裨?10 次以內(nèi)猜中它。每次我都會告訴你所猜的結(jié)果是高了還是低了。</p>

  <div class="form">
   <label for="guessField">請猜數(shù): </label>
   <input type="text" id="guessField" class="guessField">
   <input type="submit" value="確定" class="guessSubmit">
  </div>

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

  <script>

   // 開始編寫 JavaScript 代碼

  </script>
 </body>
</html>

定義變量

首先將需要使用的變量都定義出來。

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');
const guessField = document.querySelector('.guessField');

let guessCount = 1;
let resetButton;

定義猜數(shù)字主邏輯

function checkGuess() {
 let userGuess = Number(guessField.value);
 if (guessCount === 1) {
  guesses.textContent = '上次猜的數(shù)：';
 }
 guesses.textContent += userGuess + ' ';
 
 if (userGuess === randomNumber) {
  lastResult.textContent = '恭喜你！猜對了';
  lastResult.style.backgroundColor = 'green';
  lowOrHi.textContent = '';
  setGameOver();
 } else if (guessCount === 10) {
  lastResult.textContent = '!!!GAME OVER!!!';
  setGameOver();
 } else {
  lastResult.textContent = '你猜錯了！';
  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();
}

結(jié)束游戲

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

重置游戲

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;
}

瀏覽器打開

用瀏覽器打開剛剛編寫的程序，試試游戲是否能夠正常運行。

附錄

源碼

<!DOCTYPE html>
<html>

<head>
 <meta charset="utf-8">
 <title>猜數(shù)字游戲</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>猜數(shù)字游戲</h1>

 <p>我剛才隨機選定了一個100以內(nèi)的自然數(shù)?？茨隳芊裨?10 次以內(nèi)猜中它。每次我都會告訴你所猜的結(jié)果是高了還是低了。</p>

 <div class="form">
  <label for="guessField">請猜數(shù): </label>
  <input type="text" id="guessField" class="guessField">
  <input type="submit" value="確定" class="guessSubmit">
 </div>

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

 <script>

  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');
  const guessField = document.querySelector('.guessField');

  let guessCount = 1;
  let resetButton;

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

   if (userGuess === randomNumber) {
    lastResult.textContent = '恭喜你！猜對了';
    lastResult.style.backgroundColor = 'green';
    lowOrHi.textContent = '';
    setGameOver();
   } else if (guessCount === 10) {
    lastResult.textContent = '!!!GAME OVER!!!';
    setGameOver();
   } else {
    lastResult.textContent = '你猜錯了！';
    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();
  }

  guessSubmit.addEventListener('click', checkGuess);

  function setGameOver() {
   guessField.disabled = true;
   guessSubmit.disabled = true;
   resetButton = document.createElement('button');
   resetButton.textContent = '開始新游戲';
   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;
  }

 </script>
</body>
</html>

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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