javascript - 用 Javascript 创建一个猜数游戏 - 需要循环帮助

Question

到目前为止，我已经创建了一个基本的猜数字游戏，出于测试目的，当前数字设置为 50。我想知道如何添加循环以便用户可以再次猜测。我还想在屏幕上看到之前的猜测。所以它应该是这样的:

猜数字游戏!

猜测#1:49 很低

猜测#2:51 很高

猜测 #3:50 是正确的

对于循环，我知道我需要使用类似“while(!guessed)”的东西，但完全不知道如何实现它，我对此很陌生，任何帮助都会很棒!

var canvas;
canvas = openGraphics();

var max;
max = 100;

var numberToGuess;
numberToGuess = 50; // will become Math.floor( Math.random() * max ) + 1; later //
canvas.setFont("comic sans ms", "15px", Font.Bold);
canvas.drawString("Number Guessing Game!");

var guess;
guess = prompt( "Please input your first guess" );


if(guess > numberToGuess){
  var message1;
  message1 = " was HIGH";
  var messageanswer;
  messageanswer = "Guess #1 : " + guess + message1;
  canvas.drawString(messageanswer, 20,20);
}

if (guess < numberToGuess){
  var message2;
  message2 = " was LOW";
  var messageanswer2;
  messageanswer2 = "Guess #1 : " + guess + message2;
  canvas.drawString(messageanswer2, 20,20);
}

if (guess == numberToGuess){
  var message3;
  message3 = " was CORRECT";
  var messageanswer3;
  messageanswer3 = "Guess #1 : " + guess + message3;
  canvas.drawString(messageanswer3, 20,20);
}

canvas.paint();

Answer 1

你是对的，你需要使用一种while循环来持续允许输入，直到猜出数字为止。

请记住，您需要使用 dowhile 循环，因为您希望在代码运行之后(而不是之前)检查条件。

像这样的东西会起作用:

var guess;
var numberToGuess = 50;

do {
    // check previous guess and alert low/high message
    if ( guess ) {
        if ( guess > numberToGuess ) {
            alert( "Your guess was too high." );
        }
        else {
            alert( "Your guess was too low." );
        }
    }

    guess = prompt( "Please input your guess" );
} while ( guess != numberToGuess );

alert( "You guessed correctly!" );

显然，如果您愿意，您可以添加自己的计数器和消息，但这应该会让您走上正确的轨道。