如何在JavaScript中使用循环，特别是在我的程序中？

Question

我想连续循环运行下面的程序直到我的数组长度。我希望程序像第一次输入那样运行，然后在第一次比较之后程序不应该结束，而是应该运行，直到满足for循环条件。该程序如下：

var userChoice = prompt("What would you like to select: rock, paper or scissors?"); 
var computerChoice = Math.random(); 

    if(computerChoice<0.34) { 
     computerChoice = "rock"; 
    } 
    else if(computerChoice<=0.67) { 
     computerChoice = "paper"; 
    } 
    else if(computerChoice<=1) { 
     computerChoice = "scissors"; 
    } 
    console.log("Computer: "+computerChoice); 
var compare = function(choice1, choice2) { 
    if(choice1 === choice2) { 
     return "It is a tie!"; 
    } 
    else if(choice1 === rock) { 
     if(choice2 === paper) { 
      return "paper wins"; 
     } 
     else { 
      return "rock wins"; 
     } 
    } 
    else if(choice1 === paper) { 
     if(choice2 === rock) { 
      return "paper wins"; 
     } 
     else { 
      return "scissors wins"; 
     } 
    } 
    else if(choice1 === scissors) { 
     if(choice2 === paper) { 
      return "scissors wins"; 
     } 
     else { 
      return "rock wins"; 
     } 
    } 
}; 
compare(userChoice, computerChoice); 

我的数组是：

我想它是：

var userChoice = ["rock", "paper", "scissors"]; 
for(i=0; i<userChoice.length; i++) { 
    var userChoice = prompt("What would you like to select: rock, paper or scissors?"); 
var computerChoice = Math.random(); 
    if(computerChoice<0.34) { 
     computerChoice = "rock"; 
    } 
    else if(computerChoice<=0.67) { 
     computerChoice = "paper"; 
    } 
    else if(computerChoice<=1) { 
     computerChoice = "scissors"; 
    } 
    console.log("Computer: "+computerChoice); 
var compare = function(choice1, choice2) { 
    if(choice1 === choice2) { 
     return "It is a tie!"; 
    } 
    else if(choice1 === rock) { 
     if(choice2 === paper) { 
      return "paper wins"; 
     } 
     else { 
      return "rock wins"; 
     } 
    } 
    else if(choice1 === paper) { 
     if(choice2 === rock) { 
      return "paper wins"; 
     } 
     else { 
      return "scissors wins"; 
     } 
    } 
    else if(choice1 === scissors) { 
     if(choice2 === paper) { 
      return "scissors wins"; 
     } 
     else { 
      return "rock wins"; 
     } 
    } 
}; 
compare(userChoice, computerChoice); 
} 

，但它给我一个错误：不定义rock。

Answer 1

你已经错过了一些报价： -

var userChoices = ["rock", "paper", "scissors"]; 
var compare = function(choice1, choice2) { 
if(choice1 === choice2) { 
    return "It is a tie!"; 
} 
else if(choice1 === "rock") { 
if(choice2 === "paper") { 
    return "paper wins"; 
} 
else { 
    return "rock wins"; 
} 
} 
else if(choice1 === "paper") { 
if(choice2 === "rock") { 
    return "paper wins"; 
} 
else { 
    return "scissors wins"; 
} 
} 
else if(choice1 === "scissors") { 
if(choice2 === "paper") { 
    return "scissors wins"; 
} 
else { 
    return "rock wins"; 
} 
} 
}; 

for(i=0; i<userChoices.length; i++) { 
var userChoice = prompt("What would you like to select: rock, paper or scissors?"); 
var computerChoice = Math.random(); 
if(computerChoice<0.34) { 
    computerChoice = "rock"; 
} 
else if(computerChoice<=0.67) { 
computerChoice = "paper"; 
} 
else if(computerChoice<=1) { 
computerChoice = "scissors"; 
} 

var result = compare(userChoice, computerChoice); 
console.log("User: "+userChoice+", Computer: "+computerChoice+", Result: "+result); 
}