Question

我正在努力确保用户插入正确的字符串，但到目前为止似乎解决方案只是喜欢逃避我。它是一个迷你纸，剪刀，摇滚游戏。如果用户输入除allowedString之外的其他字符串，则应该要求他继续，然后会出现提示对话框。这是代码。

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";
}
console.log("Computer: " + computerChoice);

var compare = function(choice1,choice2)
{

    ch(choice1);
    if (choice1 === choice2){
        return"The result is a tie!";
    }
    else if (choice1==="rock"){
        if (choice2==="scissors"){
            return "rock wins";
        }
        else {
            return"paper wins";
        }
    }
    else if(choice1==="paper"){
        if(choice2==="rock"){
            return"paper wins";
        }
        else {
            return"scissors wins";
        }
    }
    else if (choice1==="scissors"){
        if(choice2 ==="rock"){
            return"rock wins";
        }
        else{
            return"scissors wins";
        }
     }
 }


 var ch = function(user)
 {
     allowedString = ["paper", "scissors", "rock"];
     if (!Boolean(user in allowedString)){
         if (confirm("Your choice is invalid, Do you want to try again?")) {
             userChoice = prompt("Choose rock, paper or scissors?");
             compare(userChoice, computerChoice);
         } 
         else{
             console.log("Thanks for playing");
         }
     }
     else return;
 }
 compare(userChoice, computerChoice);

Answer 1

ch验证功能有点不精确。它总是返回错误。

if (allowedString.indexOf(user) > -1)
{
   console.log('ok');
   return;
}

我认为现在它按预期工作了。如果没问题，请告诉我。

Fiddle

Answer 2

只是为了好玩，我写了我的版本：

var rules = {
    rock: {beat: ['scissors'], loses: ['paper']},
    scissors: {beat: ['paper'], loses: ['rock']},
    paper: {beat: ['rock'], loses: ['scissors']}
}

var getUserChoice = function(text){
    var userChoice = prompt(text);
    if(userChoice in rules)
        return userChoice;
    return getUserChoice("Wrong choice, try again! Choose rock, paper or scissors");
};

var getComputerChoice = function(){
    return Object.keys(rules)[Math.floor(Math.random() * 3)];
}

var getWinner = function(userChoice, computerChoice){
    if(rules[userChoice].beat.indexOf(computerChoice) !== -1)
        return 'user';
    else if(rules[userChoice].loses.indexOf(computerChoice) !== -1)
        return 'computer';
    return 'dead heat';
}

var userChoice = getUserChoice("Do you choose rock, paper or scissors?");

var computerChoice = getComputerChoice();

var winner = getWinner(userChoice, computerChoice);

console.log('userChoice=', userChoice, ', computerChoice=', computerChoice, ', winner=', winner);

条件有什么问题，我无法在javascript中验证用户输入

2 个答案: