Question

我正在做练习，而且我在使用代码时遇到了一些问题。我花了一些时间来计算使用差异的岩石剪刀配方，而不是用if来键入每个场景。但我在尝试使其在www.repl.it中运行时遇到了一些问题

var rock = 0
var paper = 1
var scissors = 2
var computerMove = rock;
var playerMove = paper;

function getWinner(playerMove,computerMove) {
  var winner;

  if (computerMove == playerMove){
     console.log("draw")
  }
  else if ((playerMove - computerMove + 3) % 3 == 1){
     var winner = "player"
  }
  else {
     winner = "computer"
  }
  return winner;
}

我之前从未使用过功能，我知道确定获胜者的公式是正确的，但我无法将任何内容分配给变量＆＃34;胜利者＆＃34;。我在这里没有收到任何错误，但赢家似乎什么都没有。

任何帮助？

Answer 1

好吧，如果这是您的整个代码，那么您就错过了该函数的实际调用。

函数的目标是编写可重用的过程，您可以多次调用它。

var rock = 0
var paper = 1
var scissors = 2
var computerMove = rock;
var playerMove = paper;

function getWinner(playerMove,computerMove) {
  var winner;

  if (computerMove == playerMove){
     console.log("draw")
  }
  else if ((playerMove - computerMove + 3) % 3 == 1){
     var winner = "player"
  }
  else {
     winner = "computer"
  }
  return winner;
}


var winner = getWinner(playerMove, computerMove);
console.log( winner );

另外，你错过了领带条件。

您可以在＆＃34; tie＆＃34;中启动内部winner var状态，并覆盖＆＃34; tie＆＃34;如果你遇到病情。

Answer 2

您可能希望继续学习功能。从上面的代码中，您实际上从未调用过该函数。您还应该更好地格式化代码，使其更具可读性。这应该有效：

var rock = 0;
var paper = 1;
var scissors = 2;

var computerMove = rock;
var playerMove = paper;

var winner;

function getWinner(playerMove, computerMove) {
    if (computerMove == playerMove) {
       winner = "draw";
    } else if ((playerMove - computerMove + 3) % 3 == 1) {
        winner = "player";
    } else {
        winner = "computer";
    }
    return winner;
}

console.log(getWinner(playerMove, computerMove));

Answer 3

你在其中一个条件中胜过胜利者，而且我没有看到你在哪里调用getWinner函数。

var rock = 0
var paper = 1
var scissors = 2
var computerMove = rock;
var playerMove = paper;

function getWinner(playerMove,computerMove) {
  var winner;

  if (computerMove == playerMove) 
  {
    console.log("draw");
  }
  else if ((playerMove - computerMove + 3) % 3 == 1)
  { 
    winner = "player";
  }
  else 
  {
    winner = "computer";
  }

  return winner;
}

$(function(){
  $('#txtWinner').text(getWinner(playerMove, computerMove));
});

使用工作代码查看此plunker： http://plnkr.co/edit/EEWbdjsp0aHR87Tx2OER?p=preview

Answer 4

请参阅代码中的注释以获取解释：

var rock = 0
var paper = 1
var scissors = 2
var computerMove = rock;
var playerMove = paper;

//declare variable outside the function if you want to be able to access it from outside of the function (look into variable scope)
var winner;

function getWinner(playerMove,computerMove) {
    if (computerMove == playerMove){
        // set a value in case of draw
        winner = "draw"
    }
    else if ((playerMove - computerMove + 3) % 3 == 1){
        // don't redeclare the variable!
        winner = "player"
    }
    else {
        winner = "computer"
    }
    return winner;
}

//call the function so it actually executes
getWinner(playerMove,computerMove);

//this should print out your answer now
console.log(winner);

Rock Paper Scissors功能无法返回合适的结果

4 个答案: