[英]Adding a guess loop to my Javascript number guessing game
我是 Javascript 的新手,我已經構建了一個簡單的數字猜謎游戲。 該程序會生成一個介於 1-10 之間的隨機數,並在您的猜測過高或過低時提示您。 如果你猜對了,你就贏了。
我想通過給玩家 3 次猜測來改進當前版本,之后玩家要么贏,要么輸。 我知道這是通過循環完成的,但我一生都無法弄清楚如何做。 我嘗試過使用 while 循環,但它不起作用。 這是我的代碼,感謝大家的幫助:
<script>
var rannum = Math.floor((Math.random() * 10) + 1); //generates a random number and stores it in the rannum variable
function submitanswer(){ //This function analyzes player response and is called by the submit button
var playerguess = document.getElementById("guess"); //grabs whatever the player types in and stores it in the playerguess variable
if (playerguess.value == rannum){ //if the value of playerguess is the same as rannum then the player wins
alert("You win!");
location.reload();
}
if (playerguess.value > rannum){ //if the player's guess is higher than the random number alert too high
alert("Too high!");
document.getElementById("guess").value='';
}
else if (playerguess.value < rannum){ //if the player's guess is lower than the random number alert too low
alert("Too low!");
document.getElementById("guess").value='';
}
}
function reloaD(){ //start over by generating a new number
document.getElementById("guess").value='';
location.reload();
}
</script>
</body>
</html>
所以這就是我對你的游戲的看法。我會盡力讓你理解我的邏輯。
首先,您需要一個輸入框,用戶將在其中輸入他/她的猜測和一個按鈕來提交該猜測:
Your Guess: <input type='text' id='guess'>
<button id="checkBtn">Check</button>
然后是按鈕單擊的事件偵聽器。 在那,我從輸入框中獲取用戶猜測的值並將其發送到另一個函數,該函數將檢查猜測是否正確、低或高。 我還保留了一個計數器,每次單擊按鈕時都會增加。 並且用戶將只能檢查直到 maxGuesses,最初為 3。當計數器等於最大猜測數時,即游戲結束並且我禁用按鈕,因此不再有輸入。
document.getElementById('checkBtn').onclick = function (){
var guess = document.getElementById('guess').value;
checkGuess(guess);
counter++;
if(counter == maxGuesses) {
alert("Game Over");
document.getElementById("checkBtn").disabled = true;
}
}
檢查猜測是否過高,過低或正確猜測是您使用的簡單邏輯,三個條件。 在正確的猜測中,用戶將顯示“你贏了!” 並且該按鈕將再次被禁用,因為游戲現在結束了。
function checkGuess(guess){
if (guess == rannum){ //if the value of playerguess is the same as rannum then the player wins
alert("You win!");
document.getElementById("checkBtn").disabled = true;
}
if (guess > rannum){ //if the player's guess is higher than the random number alert too high
alert("Too high!");
document.getElementById("guess").value='';
}
else if (guess < rannum){ //if the player's guess is lower than the random number alert too low
alert("Too low!");
document.getElementById("guess").value='';
}
}
編輯:我也添加了重啟功能。 通過添加最初隱藏的重新啟動按鈕display: none
<button id="restart" style="display:none">Restart</button>
它會在用戶獲勝或游戲結束(達到最大猜測數)時顯示。
document.getElementById("restart").style.display='block'; //making it visible
然后當用戶點擊重啟時,所有的值都會重置,重啟按鈕消失,游戲重新開始。
document.getElementById('restart').onclick = function (){
rannum = Math.floor((Math.random() * 10) + 1);
counter = 0;
guess = 0;
document.getElementById("checkBtn").disabled = false;
document.getElementById("guess").value='';
document.getElementById("restart").style.display='none';
}
你不需要在這里使用循環。 您可以只使用一個變量來跟蹤還剩下多少猜測。 每次計算答案時,都將變量減一。 如果它變為 0,則游戲失敗。
我還對您的代碼進行了其他一些改進,即:
文件 index.html:
<!DOCTYPE html>
<html>
<head>
<title>Guess the number</title>
</head>
<body>
<form>
<input type="text" id="guess" />
<input type="submit" id="submitAnswer" value="Check answer" />
</form>
<div id="answer"></div>
<script src="game.js"></script>
</body>
</html>
文件游戲.js:
(function () {
var guessesLeft, randomNumber, guessInput, submitButton, answerDisplay, maxGuesses;
maxGuesses = 3;
// Load all the element references from the DOM
// so that we don't need to do that every time we chek the answer
guessInput = document.getElementById("guess");
submitButton = document.getElementById("submitAnswer");
// Let's use a DIV element to display the answer.
// It's nicer than using alert().
answerDisplay = document.getElementById("answer");
answerDisplay.innerHTML = "Please make a guess!";
submitButton.addEventListener("click", function (event) {
event.stopPropagation();
event.preventDefault();
checkAnswer();
});
initGame();
function initGame () {
guessesLeft = maxGuesses;
randomNumber = Math.floor(Math.random() * 10 + 1);
guessInput.value = "";
}
function checkAnswer () {
if (guessInput.value == randomNumber) {
answerDisplay.innerHTML = "You win! " + randomNumber + " is correct. " +
"Please input your next guess to start again.";
initGame();
return;
}
else if (guessInput.value > randomNumber) {
answerDisplay.innerHTML = "Too high!";
}
else {
answerDisplay.innerHTML = "Too low!";
}
guessesLeft -= 1;
if (guessesLeft === 0) {
answerDisplay.innerHTML += " No guesses left - you lost!";
initGame();
}
}
}());
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