Question

我是js的新手，我刚刚根据摇滚，纸张，剪刀游戏编写了下面的基本功能。由于某种原因，比较功能的结果始终显示为a “画”而不是其他结果。我在这里做错了什么？

var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random();

if (computerChoice < 0.34) {
    computerChoice = "rock";
} else if (computerChoice <= 0.67) {
    computerChoice = "paper";
} else {
    computerChoice = "scissors";
}

choice1 = userChoice;
choice2 = computerChoice;

var compare = function (choice1, choice2) {
if (choice1 == choice2) {
        return "draw!";
}

if (choice1 == "rock") {
    if (choice2 == "scissors") {
        return "rock wins!";
    } else {
        return "paper wins!";
    }
}

if (choice1 == "paper") {
    if (choice2 == "scissors") {
        return "scissors wins!";
    } else {
        return "paper wins!";
    }
}

    if (choice1 == "scissors") {
        if (choice2 == "rock") {
            return "rock wins!";
        } else {
            return "scissors wins!";
        }
    }
};

compare();

谢谢，我们

Answer 1

您正在调用不带参数的比较：

compare();

因此choice1和choice2都等于undefined，你的游戏总是以平局结束。您应该尝试像这样调用比较函数：

compare(userChoice, computerChoice);

如果定义了一个函数，则参数列表定义函数范围内给定变量的名称。它不是函数本身应该可用的变量的命名约定。

Answer 2

您已使用两个参数定义了该函数：

var compare = function (choice1, choice2)

但是你用0调用它。

尝试指定选项：

compare("rock", "paper");

Answer 3

只能通过键入不带参数的func_name（）来打开函数，就像“干镜头”一样。阅读function declaring

var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random();
if (computerChoice < 0.34) {
  computerChoice = "rock";
} else if (computerChoice <= 0.67) {
  computerChoice = "paper";
} else {
  computerChoice = "scissors";
}
choice1 = userChoice;
choice2 = computerChoice;
function compare (choice1, choice2) {
  if (choice1 == choice2) {
    return "draw!";
  };
  if (choice1 == "rock") {
    if (choice2 == "scissors") {
      return "rock wins!";
    } else {
      return "paper wins!";
    }
  }
  if (choice1 == "paper") {
    if (choice2 == "scissors") {
      return "scissors wins!";
    } else {
      return "paper wins!";
    }
  }
  if (choice1 == "scissors") {
    if (choice2 == "rock") {
      return "rock wins!";
    } else {
      return "scissors wins!";
    }
  }
};
compare(choice1, choice2);

如果陈述不起作用

3 个答案: