基于JavaScript實現猜數字游戲代碼實例
環境
vscode 1.46 Microsoft Edge 83示例
以下內容為了解和熟悉 JavaScript，不需要理解，能夠復制粘貼并正確運行即可。
新建網頁模板
在 vscode 中新建一個 index.html 文件，然后輸入以下內容。
<!DOCTYPE html><html> <head> <meta charset='utf-8'> <title>猜數字游戲</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>猜數字游戲</h1> <p>我剛才隨機選定了一個100以內的自然數。看你能否在 10 次以內猜中它。每次我都會告訴你所猜的結果是高了還是低了。</p> <div class='form'> <label for='guessField'>請猜數: </label> <input type='text' 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;
定義猜數字主邏輯
function checkGuess() { let userGuess = Number(guessField.value); if (guessCount === 1) { guesses.textContent = ’上次猜的數：’; } 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>猜數字游戲</h1> <p>我剛才隨機選定了一個100以內的自然數。看你能否在 10 次以內猜中它。每次我都會告訴你所猜的結果是高了還是低了。</p> <div class='form'> <label for='guessField'>請猜數: </label> <input type='text' 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：’; } 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容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。
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