我'我有问题让这个javascript程序执行

I'm am having issues getting this javascript program to execute

本文关键字：javascript 程序 执行 有问题      更新时间：2023-09-26

每次我运行程序并输入堆和圈数时，我都会得到一个"TypeError: piles[pileChoice] is undefined"错误。我试过调试它几次，但我仍然不能让它正常工作。

var piles = [
  {name: 'Pile A', circles: 'ooooo'},
  {name: 'Pile B', circles: 'ooooo'},
  {name: 'Pile C', circles: 'ooooo'}
];
function boardPrint(){
  console.log("NIM");
  for(var i = 0; i < piles.length; i++) {
    console.log(piles[i].name + ": " + piles[i].circles);
  }
}
function getUserInput(){
  return prompt("Enter the letter for the pile (A-C) and the number of stones you want to remove (1-5). Example: A3").toLowerCase();
}
function userMove(){
  var pileIdx = 0;
  var valid = false;
  var numToRemove = 0;
  while(!valid) {
    var gameIns = getUserInput(); // This will now get called multiple times until user enters valid input
    var pileChoice = gameIns[0]; // This makes 'A' turn into 'a', which makes further logic easier.
    // I rebuilt this part of the function to be a bit cleaner and to show you how switch statements could be used
    switch(pileChoice){
      case 'a':
      pileIdx = 0;
      valid = true;
      break;
      case 'b':
      pileIdx = 1;
      valid = true;
      break;
      case 'c':
      pileIdx = 2;
      valid = true;
      break;
      default:
      alert('Error! Invalid input.');
    }
    numToRemove = Math.min(gameIns[1],piles[pileChoice].circles.length); // This way, they can't select a number that is greater than the number remaining in the pile.
  }
  piles[pileIdx].circles = piles[pileIdx].circles.slice(numToRemove);
}
function computerMove(move){
  // Task 1: pick a pile
  var pileIdx = 0;
  if(piles[0].circles.length > 0) { // tests for whether there are circles left in pile A
    piles[0].circles = piles[0].circles.slice(pileIdx);  // do something
  } else if(piles[1].circles.length > 0) {
    piles[1].circles = piles[1].circles.slice(pileIdx);  // do something
  } else if(piles[2].circles.length > 0) {
    piles[2].circles = piles[2].circles.slice(pileIdx);  // do something
  }
  // Task 2: pick a number to remove from the pile
  // Optional: see how many piles are left and base your number to remove on that
  //var pilesCount = 0;
  // [some logic for counting piles]
  // Otherwise, just remove all that are remaining from a pile
  //var numToRemove = 0;
  if (pilesCount > 1){
    // select a number to remove
  }
  else {
    // select another number to remove
  }
  piles[pileIdx].circles = piles[pileIdx].circles.slice(numToRemove);
}
while(true) {
  boardPrint();
  userMove();
  if (boardEmpty() === true) {
    boardPrint();
    console.log("You win!");
    break;
  }
  boardPrint();
  computerMove();
  if (boardEmpty() === true) {
    boardPrint();
    console.log("Computer wins!");
    break;
  }
}
function boardEmpty() {
  // Check if the board is empty
}

在您的userMove函数中，在while循环结束时，您尝试使用以下行设置numToRemove:

numToRemove = Math.min(gameIns[1],piles[pileChoice].circles.length); // This way, they can't select a number that is greater than the number remaining in the pile.

但是pileschoice是'a'， 'b'或'c'，对吗?所以你在开关中计算了pileIdx。您需要使用它，因为您定义堆的方式不能使用'a'， 'b'或'c'进行索引。

我认为问题就在这里:

你有

var piles = [
  {name: 'Pile A', circles: 'ooooo'},
  {name: 'Pile B', circles: 'ooooo'},
  {name: 'Pile C', circles: 'ooooo'}
];

，然后

numToRemove = Math.min(gameIns[1],piles[pileChoice].circles.length);

我想你的意思是piles[pileIdx] ?pileChoice将是一个字母，你有一个对象数组，所以你需要访问正确的索引。

你试图引用piles[pileChoice]像桩['a']，桩['b']等在gameIns[0]，但桩数组不是以这种方式格式化，因为桩是一个对象数组。

您可以尝试重新考虑您的模型堆的方式，或尝试像下面这样的解决方案来获得circles.length:

// define pileCircleCount
var pileCircleCount;
// go over your piles array
piles.forEach(function(pile) {
 // get the pile name value and retrieve the last char which is A/B/C
 // and convert it to lowercase
 var pileId = pile.name.substr(pile.name.length - 1).toLowerCase();
 // now match it up with the pileChoice, if a match is found get its
 // circle length and set it to the pileCircleCount
 if(pileId === pileChoice) {
   pileCircleCount = pile.circles.length;
 }
});
numToRemove = Math.min(gameIns[1], pileCircleCount);
相关文章：