JavaScript 中的无限循环 - while 循环

Infinite Loop in JavaScript - While Loop

本文关键字：while 循环 无限循环 JavaScript      更新时间：2023-09-26

有谁知道为什么这可能会导致无限循环。我只是不明白为什么！

我觉得问题可能出在我的 while 循环中播放到五个。

while 循环应该在 5 处停止，当玩家或计算机达到此值时，游戏应该停止。

这是石头，纸，剪刀。每场比赛的结果是玩家获胜，计算机获胜或平局。

一旦任何玩家达到 5 场胜利，游戏就应该结束。

问题是游戏没有按预期结束！

function getInput() {
  console.log("Please choose either 'rock', 'paper', or 'scissors'.");
  return prompt("Please choose either 'rock', 'paper', or 'scissors'");
}
function getPlayerMove() {
  return getInput();
}
function randomPlay() {
  var randomNumber = Math.random();
  if (randomNumber < 0.33) {
      return "rock";
  } 
  else if (randomNumber < 0.66) {
    return "paper";
  } 
  else {
    return "scissors";
  }
}

function getComputerMove() {
  return randomPlay();
}
function getWinner(playerMove,computerMove) {
  var winner;
  if (playerMove === 'rock' && computerMove === 'scissors') {  
    winner = 'Player';
  }  
  else if (playerMove === 'scissors' && computerMove === 'paper') {
    winner='Player';
  }  
  else if (playerMove === 'paper' && computerMove === 'rock') {
    winner='Player';
  } 
  else if (playerMove === 'paper' && computerMove === 'scissors') {
    winner='Computer';
  }  
  else if (playerMove === 'rock' && computerMove === 'paper') {
    winner='Computer';
  }  
  else if (playerMove === 'scissors' && computerMove === 'rock') {
    winner = 'Computer';
  }  
  else { 
  winner = "tie";
  }
  return winner;
}
// A big limitation of this game is the user is only allowed to choose once! To allow more choices you'd need to design the program differently 
function playToFive() {
  var playerWins = 0;
  var computerWins = 0;
  var playerMove = getPlayerMove();
  while ((playerWins <= 5) || (computerWins <= 5)) {
    var computerMove = getComputerMove();
    var winner = getWinner(getPlayerMove, getComputerMove);
    console.log('The player has chosen ' + playerMove + '. The computer has chosen ' + computerMove);
    if (winner === "player") {
        playerWins += 1; 
    } 
    else if (winner === "computer") {
        computerWins += 1;
    } 
    if ((playerWins = 5) || (computerWins = 5)) {
        console.log("The game is over! " + "The " + winner + " has taken out the game!");
        console.log("The final score was. " + playerWins + " to " + computerWins);
    }
    else {
        console.log("The " + winner + ' takes the round. It is now ' + playerWins + ' to ' + computerWins);
    }
  }
}
playToFive ();

问题是这一行

var winner = getWinner(getPlayerMove, getComputerMove);

您正在将函数引用传递给 getWinner(( 方法

var winner = getWinner(playerMove , computerMove );

这意味着您稍后需要再次获取移动，因此请将方法更改为(代码中修复了多个问题(

function playToFive() 
{
  var playerWins = 0;
  var computerWins = 0;
  while ((playerWins <= 5) && (computerWins <= 5))  //this line has && instead of ||
  {
    var computerMove = getComputerMove(); 
    var playerMove = getPlayerMove(); //this line is now inside while loop
    var winner = getWinner( playerMove , computerMove );
    console.log('The player has chosen ' + playerMove + '. The computer has chosen ' + computerMove);
    if (winner === "Player") { //P caps
        playerWins += 1; 
    } 
    else if (winner === "Computer") { //C caps
        computerWins += 1;
    } 
    if ((playerWins == 5) || (computerWins == 5)) { //= is replaced by ==
        console.log("The game is over! " + "The " + winner + " has taken out the game!");
        console.log("The final score was. " + playerWins + " to " + computerWins);
    }
    else {
        console.log("The " + winner + ' takes the round. It is now ' + playerWins + ' to ' + computerWins);
    }
  }
}

为了使其相应地运行：

if ((playerWins = 5) || (computerWins = 5)) {}

您需要使用 == 运算符，因为只有一个=用于值分配。

if ((playerWins == 5) || (computerWins == 5)) {}
首先

，在while循环中，你也需要更改它一个&&语句，否则如果计算机是8，玩家是3，循环将继续，直到两个玩家都是>5。

我认为首先你应该了解(==(和(===(之间的区别。

使用此代码(条件代码而不是赋值(

 if ((playerWins == 5) || (computerWins == 5)) { //use logical Operator not assignment Oprtr.
        console.log("The game is over! " + "The " + winner + " has taken out the game!");
        console.log("The final score was. " + playerWins + " to " + computerWins);
    }

而不是##

 if ((playerWins = 5) || (computerWins = 5)) { // Error Code.
            console.log("The game is over! " + "The " + winner + " has taken out the game!");
            console.log("The final score was. " + playerWins + " to " + computerWins);
        }

问题是这条线

您正在将函数引用传递给 getWinner(( 方法

使用这个

 var winner = getWinner(playerMove , computerMove );

而不是

 var winner = getWinner(getPlayerMove, getComputerMove);

对于此功能...

function getWinner(playerMove,computerMove) {
  var winner;
  if (playerMove === 'rock' && computerMove === 'scissors') {  
    winner = 'Player';
  }  
  else if (playerMove === 'scissors' && computerMove === 'paper') {
    winner='Player';
  }  
  else if (playerMove === 'paper' && computerMove === 'rock') {
    winner='Player';
  } 
  else if (playerMove === 'paper' && computerMove === 'scissors') {
    winner='Computer';
  }  
  else if (playerMove === 'rock' && computerMove === 'paper') {
    winner='Computer';
  }  
  else if (playerMove === 'scissors' && computerMove === 'rock') {
    winner = 'Computer';
  }  
  else { 
  winner = "tie";
  }
  return winner;
}

每次此方法tie设置为获胜者。

但是你应该知道(==) equalto和(===) equal value and equal type之间的区别

这里

谢谢大家。有不少问题。

干杯伙计们。绝对需要&&而不是||。 的 ||导致游戏继续甚至

var winner = getWinner(getPlayerMove， getComputerMove( 也是必需的。这导致了无限循环。

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