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HTML

              
                <div>
  <p class="player1">Player 1 GO!</p>
</div>
<div>
  <p class="you">Your turn!</p>
</div>
<div>
  <p class="player2">Player 2 GO!</p>
</div>
<div>
  <p class="computer">Computer's </p>
</div>


<div class="box">
  <div>
    <p class="score1"><span id="1score"> 0</span></p>
  </div>
  <div>
    <p class="score2"><span id="2score"> 0</span></p>
  </div>
  
  <button class="reset">reset</button>
  

  <div class="board">

    <div class="winner">
      <div class="whoWon">
        <p id="whoWon"></p>
      </div>
    </div>


    <div class="chooseMode">
      <p>How do you want to play?</p>
      <button class="player-num one-player" id="player1">One Player</button>
      <button class="player-num two-player" id="player2">Two Player</button>
    </div>

    <div class="XorO">
      <p>Would you like to be X or O?</p>
      <button class="choose-x chooseXorO" id="x">X</button>
      <button class="choose-o chooseXorO" id="o">O</button>
      <button class="back-button">Back</button>
    </div>

    <div class="game-board">
      <table id='board'>
        <tr>
          <td class="game" id="cell-0"></td>
          <td class="game" id="cell-1"></td>
          <td class="game" id="cell-2"></td>
        </tr>
        <tr>
          <td class="game" id="cell-3"></td>
          <td class="game" id="cell-4"></td>
          <td class="game" id="cell-5"></td>
        </tr>
        <tr>
          <td class="game" id="cell-6"></td>
          <td class="game" id="cell-7"></td>
          <td class="game" id="cell-8"></td>
        </tr>
      </table>
    </div>


  </div>
</div>
              
            
!

CSS

              
                .box {
  -webkit-box-shadow: 0 0 25px 3px rgba(0, 0, 0, 0.74);
  -moz-box-shadow: 0 0 25px 3px rgba(0, 0, 0, 0.74);
  box-shadow: 0 0 25px 3px rgba(0, 0, 0, 0.74);
  background-color: #F2CD32;
  position: relative;
  border-radius: 10px;
  width: 400px;
  height: 400px;
  margin: 10% auto;
  padding: 40px 0 0;
}

.board {
  background-color: #282829;
  width: 350px;
  height: 325px;
  overflow: hidden;
  position: relative;
  margin: 0 auto;
}

.winner {
  background-color: #282829;
  width: 350px;
  height: 325px;
  overflow: hidden;
  position: relative;
  margin: 0 auto;
}

.whoWon {
  width: 100%;
  height: 500px;
  top: 135px;
  text-align: center;
}

#whoWon {
  font-size: 55px;
  margin: 85px 5px 5px 5px;
  color: red;
  background-color: none;
}

button {
  cursor: pointer;
}

.chooseMode,
.XorO {
  font-size: 30px;
  color: white;
  display: block;
  width: 100%;
  height: 500px;
  position: absolute;
  top: 35px;
  text-align: center;
}

.chooseMode button,
.XorO button {
  border: 2px solid transparent;
  font-size: 26px;
  opacity: .5;
  background: none;
  color: white;
  margin: 15px;
}

.chooseMode button:hover,
.XorO button:hover {
  border-radius: 20px;
  border: 2px solid transparent;
  opacity: 1;
  border: 2px dashed rgba(230, 230, 230, .5);
}

.chooseMode button:focus,
.XorO button:focus {
  outline: 0;
}

.XorO button.back-button {
  border: none;
  display: block;
  position: absolute;
  left: 240px;
  top: 200px;
}

.reset {
  position: absolute;
  top: 5px;
  right: 20px;
  border: none;
  border: 2px transparent;
  background: none;
  opacity: .8;
  display: none;
}

.score1 {
  position: absolute;
  top: 5px;
  left: 30px;
  border: none;
  border: 2px transparent;
  background: none;
  opacity: .8;
  font-family: "Times New Roman", Times, serif;
  font-weight: bold;
}

.score2 {
  position: absolute;
  top: 5px;
  left: 130px;
  border: none;
  border: 2px transparent;
  background: none;
  opacity: .8;
  font-size: 15px;
  font-family: "Times New Roman", Times, serif;
  font-weight: bold;
}

table {
  background-color: none;
  width: 340px;
  margin-left: 5px;
  margin-top: 5px;
  height: 315px;
  text-align: center;
  color: white;
  font-size: 45px;
  cursor: pointer;
}

table td {
  width: 80px;
  height: 80px;
}

table td,
table th {
  border: 3px solid white;
}

table tr:first-child td {
  border-top: 0;
}

table tr:last-child td {
  border-bottom: 0;
}

table tr td:first-child,
table tr th:first-child {
  border-left: 0;
}

table tr td:last-child,
table tr th:last-child {
  border-right: 0;
}

.player1 , .you {
  padding: 20px;
  margin: 85px 600px -150px 470px;
  text-align: center;
  background-color: green;
  border-radius: 5px;
  font-size: 17px;
  font-weight: bold;
}

.player2 , .computer{
  padding: 20px;
  margin: 85px 470px -137px 600px;
  text-align: center;
  background-color: yellow;
  border-radius: 5px;
  font-size: 17px;
  position: relative;
  font-weight: bold;
}


/*.players{display: none;} */

.XorO {
  display: none;
}

.game-board {
  display: none;
}

.message {
  /*   display: none; */
  visibility: hidden;
}

.player1,
.player2,
.you,
.computer{
  /*   display: none; */
  visibility: hidden;
  font-family: Lobster, "Times New Roman", Times, serif;
}

.draw {
  display: none;
}

.winner {
  display: none;
}

.score1 {
  display: none;
}

.score2 {
  display: none;
}
              
            
!

JS

              
                var gameType;//choose between 1 player game or 2 player game.
var AItimer;
var player1Timer;
var player2Timer;
var playerTimer;
var computerTimer;

//PLAYER BUTTON - Choose beetween one player or two player game.
$(".player-num").on("click", function(evt) {
  gameType = $(this).attr("id");
  console.log("gameType: " + gameType);
  
  if (gameType === "player2") {
    $("td").addClass("twoPlayerGame");
  }
  else if (gameType === "player1") {
    $("td").addClass("onePlayerGame");
  }
  
  $(".chooseMode").hide();
  $(".XorO").show();
});

//CHOICE BUTTON - Choose X or O.
$(".chooseXorO").on("click", function(evt) {
  var choiceA = $(this).attr("id").toUpperCase();
  //console.log("choiceA: " + choiceA);
  
  $(".XorO").hide();
  $(".reset").show();
  $(".game-board").show();
  
  i = 1;
  index = Math.floor(Math.random() * values.length);
  playsFirst = values[index];

  $(".score1").show();
    $(".score2").show();
  
  if (gameType === "player2") {
    if (player1 === playsFirst) {
        $('.player1').css('visibility', 'visible');
        $('.player2').css('visibility', 'hidden');
      }
      else {
        $('.player2').css('visibility', 'visible');
        $('.player1').css('visibility', 'hidden');
      }
    $(".score1").html(`player 1: ${0}`);
    $(".score2").html(`player 2: ${0}`);
    setValues(choiceA);
  }
  else {
    $(".score1").html(`you: ${0}`);
    $(".score2").html(`computer: ${0}`);
    computer(choiceA);
  }
});

//goes back to how many players menu.
$(".back-button").on("click", function(evt) {
  $(".XorO").hide();
  $(".chooseMode").show();
  $("td").removeClass("twoPlayerGame");
  $("td").removeClass("onePlayerGame");
});

// resets all options.
$(".reset").on("click", function(evt) {
  $(".XorO").hide();
  $(".game-board").hide();
  $(".reset").hide();
  $(".chooseMode").show();
  diakoptis = false;
  //$(".message").html("");
  //$('.message').css('visibility', 'hidden');
  $('.player1').css('visibility', 'hidden');
  $('.player2').css('visibility', 'hidden');
  $('.computer').css('visibility', 'hidden');
  $('.you').css('visibility', 'hidden');
  $(".score1").hide();
  $(".score2").hide();
  $(".player1").stop(true, true); //stops the fadeIn if the user presses "reset"right after he wins.
  $(".player2").stop(true, true); // >> >> >>
  $(".winner").hide();
  playsSecond = "";
  playsFirst = "";
  i = 0;
  $(".game").text(""); //or this $(“.game").each(function(){ $(this).empty(); }) .
  cellValues = [];
  Xvalues = [];
  Ovalues = [];
  winner = false;
  gamesXwon = 0; //O score.
  gamesOwon = 0; //0 score.
  $("#1score").text(" " + 0);
  $("#2score").text(" " + 0);
  $("td").removeClass("twoPlayerGame");
  $("td").removeClass("onePlayerGame");
  clearTimeout(playerTimer);
  clearTimeout(computerTimer);
  clearTimeout(player1Timer);
  clearTimeout(player2Timer);
  clearTimeout(AItimer);
  compTurn = false;
  console.clear();
});



var player1; //keeps track of who's player1.
//assigns value to playsSecond according to playsFirst.
function setValues(choice) {
  player1 = choice;

  if (playsFirst === "X") {
    playsSecond = "O";
  }
  else {
    playsSecond = "X";
  }
}






var HUMAN;
var COMP;
var compTurn = false; //checks if its the computers turn.
//Puts values in computer and player(X or O) in playerVScomputer mode.
function computer(value) {
  console.log("plays first: " + playsFirst);

  HUMAN = value;
  COMP = HUMAN == "X" ? "O" : "X";
  console.log("COMP is: " + COMP);
  if (playsFirst === COMP) {
    $('.computer').css('visibility', 'visible');
    compTurn = true;
    AIturn();
  } 
  else{
    compTurn = false
    $('.you').css('visibility', 'visible');
  }
}

//Handles computer moves.
function AIturn() {
  if (compTurn === true) {
    var emptyTable = [];
    var j = 0;
    cellNames.forEach(function(cell) {
      if ($(cell).text() === "") {
        emptyTable.push(j);
      }
      j++;
    });
    console.log("empty table: " + emptyTable);
    var rand = Math.floor(Math.random() * emptyTable.length);
    console.log("IM IN " + cellNames[emptyTable[rand]]);

    //makes the computer to play with 2 seconds delay.
    AItimer = setTimeout(function() {
      $(cellNames[emptyTable[rand]]).html(COMP);
      $('.you').css('visibility', 'visible');
      $('.computer').css('visibility', 'hidden');
      compTurn = false;
      i++;
      //a win can be done only after 5 moves in total of both players.
      if (emptyTable.length < 5) {
        checkForWin();
        console.log("TRUE BITCH");
      }
      console.log("i is: " + i);
    }, 2000);
  }
}



//Handles player moves for playerVScomputer mode.
$(document).on("click", ".onePlayerGame", function(evt) {
  //checks if the cell is emtpy.
  if ($(evt.target).html() === "") {
    if (compTurn === false) {
      $('.computer').css('visibility', 'visible');
      $('.you').css('visibility', 'hidden');
      console.log(HUMAN);
      $(this).html(HUMAN);
      $('.you').css('visibility', 'hidden');
      $('.computer').css('visibility', 'visible');
      i++;
      compTurn = true;
      if (i > 5) {
        //a win can be done only after 5 moves in total of both players.
        checkForWin();
      }
      console.log("i is player : " + i);
      AIturn();
    }
  }
});






var values = ["X", "O"];
var index = Math.floor(Math.random() * values.length);
var playsFirst = values[index]; //randomly chooses who plays first.
var playsSecond; //plays second.
var i = 0; //moves played.
//Puts values on click to empty cells .
$(document).on("click", ".twoPlayerGame", function(evt) {
  //$('.message').css('visibility', 'hidden');

  if ($(evt.target).html() === "") {
    //checks if the cell is emtpy.
    if (i % 2 !== 0) {
      //first player plays in all odd moves.
      $(this).html(playsFirst);
      if (player1 === playsFirst) {
        $('.player1').css('visibility', 'hidden');
        $('.player2').css('visibility', 'visible');
      }
      else {
        $('.player2').css('visibility', 'hidden');
        $('.player1').css('visibility', 'visible');
      }
    }
    else {
      $(this).html(playsSecond);
      if (player1 === playsSecond) {
        $('.player1').css('visibility', 'hidden');
        $('.player2').css('visibility', 'visible');
      }
      else {
        $('.player2').css('visibility', 'hidden');
        $('.player1').css('visibility', 'visible');
      }
    }
    i++;
    if (i > 5) {
      //a win can be done only after 5 moves in total of both players.
      checkForWin();
    }
  }
});







  var cellNames = [
    "#cell-0",
    "#cell-1",
    "#cell-2",
    "#cell-3",
    "#cell-4",
    "#cell-5",
    "#cell-6",
    "#cell-7",
    "#cell-8"
  ];
  var winCombos = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6]
  ];
  var cellValues = [];
  var Xvalues = [];
  var Ovalues = [];
  var winner = false;
//Checks if there is a winner to stop the game.
function checkForWin() {

  console.log("fuck off");
  var j = 0;
  var three = 0; //needs to be 3 in order to have a winner.
  cellNames.forEach(function(cell) {
    cellValues[j] = $(cell).text();
    if (cellValues[j] === "X" && Xvalues.indexOf(j) === -1) {
      Xvalues.push(j);
    }
    else if (cellValues[j] === "O" && Ovalues.indexOf(j) === -1) {
      Ovalues.push(j);
    }
    j++;
  });
  console.log("Xvalues: " + Xvalues);
  console.log("Ovalues : " + Ovalues);

  //checks if X won.
  for (var x = 0; x < winCombos.length; x++) {
    for (var t = 0; t < Xvalues.length; t++) {
      if (winCombos[x].indexOf(Xvalues[t]) != -1) {
        three++;
        if (three === 3) {
          console.log("X won!! yayy");
          winner = true;
          if (gameType === "player2") {
            if (player1 === "X") {
              $("#whoWon").text("Player 1 won!");
              newRound("X");
            } else
            {
              $("#whoWon").text("Player 2 won!");
              newRound("X");
            }
          }
          else {
            if (HUMAN === "X") {
              $("#whoWon").text("You won!");
              newRound("X");
            }
            else {
              $("#whoWon").text("Computer won!");
              newRound("X");
            }
          }
        }
      }
    }
    three = 0;
  }
  //checks if O won.
  for (var a = 0; a < winCombos.length; a++) {
    for (var b = 0; b < Ovalues.length; b++) {
      if (winCombos[a].indexOf(Ovalues[b]) != -1) {
        three++;
        if (three === 3) {
          console.log("O won!! yayy");
          winner = true;
          if (gameType === "player2") {
            if (player1 === "O") {
              $("#whoWon").text("Player 1 won!");
              newRound("O");
            }
            else {
              $("#whoWon").text("Player 2 won!");
              newRound("O");
            }
          }
          else {
            if (HUMAN === "O") {
              $("#whoWon").text("You won!");
              newRound("O");
            }
            else {
              $("#whoWon").text("Computer won!");
              newRound("O");
            }
          }
        }
      }
    }
    three = 0;
  }
  if (Ovalues.length + Xvalues.length === 9 && winner === false) {
    $("#whoWon").text("its a draw..");
    newRound();
  }
  
    if(winner === true){
    return true;
  }
}




var gamesXwon = 0; //O score.
var gamesOwon = 0; //O score.
//CALLS A NEW ROUND.
function newRound(champion) {
  
  //hide all menus/tags.
  $('.player1').css('visibility', 'hidden');
  $('.player2').css('visibility', 'hidden');
  $('.you').css('visibility', 'hidden');
  $('.computer').css('visibility', 'hidden');

  $(".winner").show();
  $(".winner").delay(4000).fadeOut(500);

  
  //keeps track of score.
  if (champion === "X") {
    //if X won, X plays first in the next round.
    gamesXwon++;
    //playsFirst = player1;
    playsFirst = "X";
    playsSecond = "O";
  } else if (champion === "O") {
    //if O won, O plays first in the next round.
    gamesOwon++;
    //player1 = playsSecond;
    playsFirst = "O";
    playsSecond = "X";
  }
  else {
      //if its a draw, the player who played first now plays second.
    var z = playsFirst;
    playsFirst = playsSecond;
    playsSecond = z;
  }
  

    //clear values for new game.
  i = 1;
  $(".game").text("");
  cellValues = [];
  Xvalues = [];
  Ovalues = [];
  winner = false;
  
  
    //fade in the player who plays first(winner).
  if ($("td").hasClass("twoPlayerGame")) {
    
    //updating score.
    if(player1 === "X"){
      $(".score1").html(`player 1: ${gamesXwon}`);
      $(".score2").html(`player 2: ${gamesOwon}`);
    }
    else{
      $(".score1").html(`player 1: ${gamesOwon}`);
      $(".score2").html(`player 2: ${gamesXwon}`);
    }
    
    if (playsFirst === player1) {
      //$(".player1").delay(4000).fadeIn(500);
      //$('.player1').css('visibility', 'visible');
      player1Timer = setTimeout(() => { $('.player1').css('visibility', 'visible'); }, 4000)
      
    }
    else {
      //$(".player2").delay(4000).fadeIn(500);
      //$('.player2').css('visibility', 'visible');
      player2Timer = setTimeout(() => { $('.player2').css('visibility', 'visible'); }, 4000)
    }
  }
  else if($("td").hasClass("onePlayerGame")){
    
    //updating score.
    if(HUMAN === "X"){
      $(".score1").html(`you: ${gamesXwon}`);
      $(".score2").html(`computer: ${gamesOwon}`);
    }
    else{
      $(".score1").html(`you: ${gamesOwon}`);
      $(".score2").html(`computer: ${gamesXwon}`);
    }
    
    if (playsFirst === HUMAN) {
      //$(".you").delay(4000).fadeIn(500);
      
      playerTimer = setTimeout(() => { $('.you').css('visibility', 'visible'); }, 4000)
      
      clearTimeout(AItimer);
      compTurn = false;
      console.log("hear here");
    }
    else {
      //$(".computer").delay(4000).fadeIn(500);
      
      computerTimer = setTimeout(() => { $('.computer').css('visibility', 'visible'); }, 4000)
      
      compTurn = true;
      setTimeout(AIturn, 4000);
    }
  }
}

              
            
!
999px

Console