你的if else语句在我的石头剪刀布游戏中有什么问题？

huangapple
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英文:

What is wrong with my if else statements for my rock paper scissor game?

问题

I have translated the code for you. Here it is:

  1. function getComputerChoice() {
  2.     const randomNumber = Math.floor(Math.random()*3);
  3.     switch(randomNumber) {
  4.         case 0:
  5.             return "rock";
  6.         case 1: 
  7.             return "paper";
  8.         case 2:
  9.             return "scissors";
  10.     };
  11. }
  13. function getPlayerChoice() {
  14.     return prompt("rock, paper, or scissors?").toLowerCase();
  15. }
  17. function playRound(playerSelection, computerSelection) {
  18.     computerSelection = getComputerChoice();
  19.     playerSelection = getPlayerChoice();
  21.     if (computerSelection === playerSelection) {
  22.         console.log("Tie");
  23.     } else if (computerSelection === "rock" && playerSelection === "scissors") {
  24.         console.log("You lose! Rock beats Scissors");
  25.     } else if (computerSelection === "paper" && playerSelection === "rock") {
  26.         console.log("You lose! Paper beats Rock");
  27.     } else if (computerSelection === "scissors" && playerSelection === "paper") {
  28.         console.log("You lose! Scissors beats Paper");
  29.     } else if (playerSelection === "rock" && computerSelection === "scissors") {
  30.         console.log("You win! Rock beats Scissors");
  31.     } else if (playerSelection === "paper" && computerSelection === "rock") {
  32.         console.log("You win! Paper beats Rock");
  33.     } else if (playerSelection === "scissors" && computerSelection === "paper") {
  34.         console.log("You win! Scissors beats Paper");
  35.     }
  36. }

I've removed the HTML entities (e.g., ") and provided a cleaner version of your JavaScript code.

英文:

I am attempting to make a Rock Paper Scissors game in JavaScript, however, every time I run it the console logs the last option "You win! Scissors beats Paper" even if my selection was something other than scissors. I believe I made an error with my if else statements but maybe the problem comes from some other part.

  1. function getComputerChoice() {
  2.     const randomNumber = Math.floor(Math.random()*3);
  3.     switch(randomNumber) {
  4.         case 0:
  5.             return "rock";
  6.         case 1: 
  7.             return "paper";
  8.         case 2:
  9.             return "scissors";
  10.     };
  11.     }
  14. function getPlayerChoice() {
  15.     prompt("rock paper or scissors?").toLowerCase();
  16. }
  21.  function playRound (playerSelection,computerSelection) {
  22.     computerSelection = getComputerChoice()
  23.     playerSelection = getPlayerChoice()
  25.     
  27.         
  29.     if (computerSelection === playerSelection) {
  30.         console.log  ("Tie");
  31.     }
  32.    
  33.     else if (computerSelection === "rock" && playerSelection === "scissors") {
  34.         console.log ("You lose! Rock beats Scissors");
  35.     }
  36.     else if (computerSelection === "paper" && playerSelection === "rock") {
  37.         console.log ("You lose! Paper beats Rock");
  38.     }
  39.     else if (computerSelection === "scissors" && playerSelection === "paper") {
  40.         console.log ("You lose! Scissors beats Paper");
  41.     }
  43.     else if (playerSelection === "rock" && computerSelection === "scissors") {
  44.         console.log ("You win! Rock beats Scissors");
  45.     }
  46.     else if (playerSelection === "paper" && computerSelection === "rock") {
  47.         console.log ("You win! Paper beats Rock");
  48.     }
  49.     else  (playerSelection === "scissors" && computerSelection === "paper") ;{
  50.         console.log ("You win! Scissors beats Paper");
  51.     }
  54. }

答案1

得分: 1

有两个问题导致代码无法正常运行。首先，你的函数 getPlayerChoice() 没有返回任何值。结果，playerSelection === undefined 而不是你预期的值。由于你的 if 语句没有考虑到这一点，它们最终都变为 false。这导致了执行你的 else 语句。

应该是：

  1. function getPlayerChoice() {
  2.     return prompt("rock paper or scissors?").toLowerCase();
  3. }

第二个问题是 else 语句内部不应该有条件。

解决方案：

  1. else {
  2.     console.log("You win! Scissors beats Paper");
  3. }

请注意，在你的第一个函数的 switch 语句后面不需要分号，但似乎它并不导致代码故障。

英文:

There are two issues that makes the code not run as it should. The first is that your function getPlayerChoice() does not return any values. As a result, playerSelection === undefined instead of your intended values. Since your if statements don't account for that, they all end up false. This leads to your else statement being executed.

It should be:

  1. function getPlayerChoice() {
  2.     return prompt("rock paper or scissors?").toLowerCase();
  3. }

The second is that else should not have a condition inside it.

Solution:

  1. else {
  2.         console.log ("You win! Scissors beats Paper");
  3. }

Note that you don't need the semicolon after your switch statement in your first function, but it doesn't seem to cause the code to malfunction.

huangapple
  • 本文由 发表于 2023年5月22日 09:33:33
  • 转载请务必保留本文链接：https://go.coder-hub.com/76302596.html
  • if-statement
  • javascript
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