[英]Adding a guess loop to my Javascript number guessing game
我是 Javascript 的新手,我已经构建了一个简单的数字猜谜游戏。 该程序会生成一个介于 1-10 之间的随机数,并在您的猜测过高或过低时提示您。 如果你猜对了,你就赢了。
我想通过给玩家 3 次猜测来改进当前版本,之后玩家要么赢,要么输。 我知道这是通过循环完成的,但我一生都无法弄清楚如何做。 我尝试过使用 while 循环,但它不起作用。 这是我的代码,感谢大家的帮助:
<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>
所以这就是我对你的游戏的看法。我会尽力让你理解我的逻辑。
首先,您需要一个输入框,用户将在其中输入他/她的猜测和一个按钮来提交该猜测:
Your Guess: <input type='text' id='guess'>
<button id="checkBtn">Check</button>
然后是按钮单击的事件侦听器。 在那,我从输入框中获取用户猜测的值并将其发送到另一个函数,该函数将检查猜测是否正确、低或高。 我还保留了一个计数器,每次单击按钮时都会增加。 并且用户将只能检查直到 maxGuesses,最初为 3。当计数器等于最大猜测数时,即游戏结束并且我禁用按钮,因此不再有输入。
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;
}
}
检查猜测是否过高,过低或正确猜测是您使用的简单逻辑,三个条件。 在正确的猜测中,用户将显示“你赢了!” 并且该按钮将再次被禁用,因为游戏现在结束了。
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='';
}
}
编辑:我也添加了重启功能。 通过添加最初隐藏的重新启动按钮display: none
<button id="restart" style="display:none">Restart</button>
它会在用户获胜或游戏结束(达到最大猜测数)时显示。
document.getElementById("restart").style.display='block'; //making it visible
然后当用户点击重启时,所有的值都会重置,重启按钮消失,游戏重新开始。
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';
}
你不需要在这里使用循环。 您可以只使用一个变量来跟踪还剩下多少猜测。 每次计算答案时,都将变量减一。 如果它变为 0,则游戏失败。
我还对您的代码进行了其他一些改进,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>
文件游戏.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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