javascript - 井字棋游戏，玩家 2 在 if 语句中放置棋子时出错

Question

我正在尝试使用浏览器控制台一步一步地制作井字游戏，并最终改进我的功能。然而，我被困在玩家2回合(ttt_player2_turn())，我必须检查箱子是否为空。看来我在这个例子中的论证有问题。感谢您的建议(有lodash功能)。编辑:现在函数中的问题是它没有验证 is_case_free 语句。

// to have a printed board
function ttt_print_board(array){
  return ('\n' +
        ' ' + array[0] + ' | ' + array[1] + ' | ' + array[2] + '\n' +
        ' ---------\n' +
        ' ' + array[3] + ' | ' + array[4] + ' | ' + array[5] + '\n' +
        ' ---------\n' +
        ' ' + array[6] + ' | ' + array[7] + ' | ' + array[8] + '\n')
}

//display things
function ttt_display(stuff){
  console.log(stuff)
}

//ask something
function ttt_ask(question) {
  return prompt(question)
}

// to verify if the answers is between 1-9
function ttt_verify_response(response) {
  var integer_response = _.toInteger(response)
  if(integer_response < 10 && integer_response > 0 && _.isInteger(integer_response)){
    return true
  } else {
    return false
  }
}

// this is my function to verify if case empty or not, at the moment just for 'x'
function ttt_verify_case (board, response) {
  if(board[response] === 'x' ){
  return false
  } else{
  return true
  }
}

// return the player 1 choice
function ttt_player1_turn() {
  var response = 0;
  var is_correct_response = false
  while(! is_correct_response){
    response = ttt_ask("player 1 it's your turn (play 1 to 9)")
    is_correct_response = ttt_verify_response(response)
  }
  return response
}

//return the player 2 choice and have to check if the case is empty from 'x', it seems like it doesn't go through the 2nd if condition
function ttt_player2_turn(board) {
  var is_correct_response = false
  var is_case_free = false
  while(!is_correct_response || !is_case_free){
    var response_player2 = ttt_ask("player 2 it's your turn, play 1 to 9");
    is_correct_response = ttt_verify_response(response_player2)
    if (!is_correct_response) {
      console.log("incorrect response")
      continue
    }
    is_case_free = ttt_verify_case(board, response_player2);
    if(!is_case_free) {
      console.log("player 1 already put a piece on this case")
    }
  }
  return response_player2
}


//main function
function ttt_new_game() {
  var board = [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']
  var printed_board = ttt_print_board(board)
  ttt_display(printed_board)
  board[_.toInteger(ttt_player1_turn()) - 1] = 'x'
  ttt_display(ttt_print_board(board))
  board[_.toInteger(ttt_player2_turn()) - 1] = 'o'
  ttt_display(ttt_print_board(board))
}

Answer 1

我发现了我的错误，因为它是一个数组，我在 ttt_verify_case 中忘记了 -1 响应。

// this is my function to verify if case empty or not, at the moment just for 'x'
function ttt_verify_case (board, response) {
  if(board[response - 1] === 'x' ){
  return false
  } else{
  return true
  }
}