我正在制作一个猜数字游戏，我想测试变量guess是否大于变量difficulty。 difficulty已从我的HTML页面中删除，并且它与guess无法正确比较。
//Initialize variables for player guess, guess counter and previous guesses
var guess = 0;
var guessCount = 0;
var previousGuesses = [];
function startGame() {
//Calculate difficulty
var difficulty = document.getElementById("difficulty").value;
//Calculate secret number
var secretNumber = Math.floor((Math.random() * difficulty) + 1);
//Repeats while player has not guessed the secret number
while (guess != secretNumber) {
//Checks for Cancel button pressed
guess = prompt("Enter your guess: ");
if (guess == null) {
return;
}
//Checks for empty string/no input
else if (guess == "") {
alert("Please enter a number");
}
//Checks if previously guessed
else if (previousGuesses.includes(guess)) {
alert("You have guessed this number before. Please try a different number.");
}
else if (guess < 1) {
alert("Please enter a number between 1-" + difficulty);
}
//Checks if guess is higher than secretNumber
else if (guess > secretNumber) {
alert("Your guess is too high");
//Increments guess counter
guessCount++;
//Adds the previous guess to previousGuesses
previousGuesses.push(guess);
}
//Checks if guess is lower than secretNumber
else if (guess < secretNumber) {
alert("Your guess is too low");
//Increments guess counter
guessCount++;
//Adds the previous guess to previousGuesses
previousGuesses.push(guess);
}
//Checks for correct guess
else if (guess == secretNumber) {
//Increments guess counter
guessCount++;
//Checks for correct grammar - guesses or guess
if (guessCount > 1) {
alert("Congratulations, you guessed the correct number in " + guessCount + " guesses!");
}
else {
alert("Congratulations, you guessed the correct number in " + guessCount + " guess!");
}
}
}
//Resets variables to play again
guess = 0;
guessCount = 0;
previousGuesses = [];
}body {
font-family: sans-serif;
text-align: center;
animation: background 10s infinite;
}
h1 {
margin-top: 48px;
margin-bottom: 48px;
animation: heading 10s infinite;
}
button {
height: 48px;
width: 250px;
font-size: 24px;
}<h1>Guess the Number</h1>
<button onclick="startGame()">Start the Game</button>
<h2>Difficulty</h2>
<select id="difficulty">
<option value="10">Beginner</option>
<option value="50">Intermediate</option>
<option value="100">Hard</option>
</select>阅读本文：关键信息
这段代码有效，但我想要发生一些事情：当猜测大于difficulty时，我想打印"Please enter a number between 1-" + difficulty。但是，当我更改此代码时：
else if (guess < 1) {
alert("Please enter a number between 1-" + difficulty);
}
进入这个：
else if (guess < 1 || guess > difficulty) {...}
（编辑：上面的代码是为了找出猜测是否大于difficulty）
然后会发生的事情是除了1，difficulty以及任何超过difficulty之外的任何猜测都会被Please enter a number提醒。
我该怎么解决这个问题？
你在比较字符串而不是数字。将字符串转换为数字。
else if (parseInt(guess) < 1 || parseInt(guess) > parseInt(difficulty))
更好的方法：输入后直接转换它......
guess = parseInt(prompt("Enter your guess: "));
...将难度值作为数字
var difficulty = parseInt(document.getElementById("difficulty").value);
//Initialize variables for player guess, guess counter and previous guesses
var guess = 0;
var guessCount = 0;
var previousGuesses = [];
function startGame() {
//Calculate difficulty
var difficulty = parseInt(document.getElementById("difficulty").value);
//Calculate secret number
var secretNumber = Math.floor((Math.random() * difficulty) + 1);
//Repeats while player has not guessed the secret number
while (guess != secretNumber) {
//Checks for Cancel button pressed
guess = parseInt(prompt("Enter your guess: "));
if (guess == null) {
return;
}
//Checks for empty string/no input
else if (guess == "") {
alert("Please enter a number");
}
//Checks if previously guessed
else if (previousGuesses.includes(guess)) {
alert("You have guessed this number before. Please try a different number.");
}
else if (guess < 1 || guess > difficulty) {
alert("Please enter a number between 1-" + difficulty);
}
//Checks if guess is higher than secretNumber
else if (guess > secretNumber) {
alert("Your guess is too high");
//Increments guess counter
guessCount++;
//Adds the previous guess to previousGuesses
previousGuesses.push(guess);
}
//Checks if guess is lower than secretNumber
else if (guess < secretNumber) {
alert("Your guess is too low");
//Increments guess counter
guessCount++;
//Adds the previous guess to previousGuesses
previousGuesses.push(guess);
}
//Checks for correct guess
else if (guess == secretNumber) {
//Increments guess counter
guessCount++;
//Checks for correct grammar - guesses or guess
if (guessCount > 1) {
alert("Congratulations, you guessed the correct number in " + guessCount + " guesses!");
}
else {
alert("Congratulations, you guessed the correct number in " + guessCount + " guess!");
}
}
}
//Resets variables to play again
guess = 0;
guessCount = 0;
previousGuesses = [];
}<h1>Guess the Number</h1>
<button onclick="startGame()">Start the Game</button>
<h2>Difficulty</h2>
<select id="difficulty">
<option value="10">Beginner</option>
<option value="50">Intermediate</option>
<option value="100">Hard</option>
</select>改变else if (guess < 1 || guess > parseInt(difficulty))
到else if (parseInt(guess) < 1 || parseInt(guess) > parseInt(difficulty))
或更改输入的类型
guess = parseInt(prompt("Enter your guess: "));
您还可以使用内置的Number功能。看看我如何修复下面的代码：
difficulty = Number(difficulty);
guess = Number(guess);
在声明变量之后尝试应用它，它应该工作！
更改为此应该有助于：
else if (guess < 1 || guess > parseInt(difficulty)) {