我像往常一样在做摇滚/纸/剪刀游戏。不知何故，我的if和switch语句无法读取其他两个函数设置的值，当我console.log result返回时undefined
但是，当我手动设置user和computer变量decideWinner功能按预期工作时。
我一直在修补它几个小时，如果能提供一些帮助，将不胜感激。谢谢。
let user
let computer
let result
//1
function userChoice() {
let user = prompt(`rock, paper, scissors`)
}
//2
function computersTurn() {
let randomNumber = Math.floor((Math.random() * 3) + 1);
switch (randomNumber) {
case 1:
computer = `rock`;
break;
case 2:
computer = `scissors`;
break;
case 3:
computer = `paper`;
break;
}
}
//3
function decideWinner() {
if (user == `rock`) {
switch (computer) {
case `rock`:
result = `tie`
break;
case 'scissors':
result = `player`
break;
case `paper`:
result = `computer`
break;
}
} else if (user == `paper`) {
switch (computer) {
case `rock`:
result = `player`
break;
case 'scissors':
result = `computer`
break;
case `paper`:
result = `tie`
break;
}
} else if (user == `scissors`) {
switch (computer) {
case `rock`:
result = `computer`
break;
case 'scissors':
result = `tie`
break;
case `paper`:
result = `player`
break;
}
}
}
userChoice();
computersTurn();
decideWinner();
console.log(result);您不应重新创建该user变量。执行此操作时，user会在本地创建另一个变量，并将提示结果分配给该变量，从而保持全局user变量未定义。使用user = ...代替let user = ...：
let user
let computer
let result
//1
function userChoice() {
user = prompt(`rock, paper, scissors`)
}
//2
function computersTurn() {
let randomNumber = Math.floor((Math.random() * 3) + 1);
switch (randomNumber) {
case 1:
computer = `rock`;
break;
case 2:
computer = `scissors`;
break;
case 3:
computer = `paper`;
break;
}
}
//3
function decideWinner() {
if (user == `rock`) {
switch (computer) {
case `rock`:
result = `tie`
break;
case 'scissors':
result = `player`
break;
case `paper`:
result = `computer`
break;
}
} else if (user == `paper`) {
switch (computer) {
case `rock`:
result = `player`
break;
case 'scissors':
result = `computer`
break;
case `paper`:
result = `tie`
break;
}
} else if (user == `scissors`) {
switch (computer) {
case `rock`:
result = `computer`
break;
case 'scissors':
result = `tie`
break;
case `paper`:
result = `player`
break;
}
}
}
userChoice();
computersTurn();
decideWinner();
console.log(result);注意：您可以computersTurn用更简单的方式重写您的函数：
function computersTurn() {
let choices = ["rock", "scissors", "paper"];
let randomNumber = Math.floor((Math.random() * 3));
computer = choices[randomNumber];
}
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