Question

var userChoice = prompt("What would you like to play?"),
    computerChoice = Math.random();
if (computerChoice <= 0.34){
    computerChoice = "Rock";
}
else if (computerChoice >= 0.35 && computerChoice <= 0.67){
    computerChoice = "Paper";
}
else {
    computerChoice = "Scissors";
}   
document.write("Computer's choice is " + computerChoice);
var compare = function(choice1, choice2) {
    if (choice1 === choice2){
        return "This 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";
        }
    }
};

document.write(compare(userChoice, computerChoice));

<!doctype html>
<html>
<title>JS Practice</title>
<head>
	<script language="javascript">
</script>
</head>
<body>
	
	

</body>

</html>

请帮助我理解为什么它不显示返回的字符串？当你赢或输的时候应该显示结果。我从codeacademy获得了这段代码。在他们的控制台上运行完美，但是当你尝试在浏览器上运行它时，它无法正常工作。困惑......

var userChoice = prompt("What would you like to play?");
	var computerChoice = Math.random();
	if (computerChoice <= 0.34){
		computerChoice = "Rock";
	}
	else if (computerChoice >= 0.35 && computerChoice <= 0.67){
		computerChoice = "Paper";
		}
	else {
		computerChoice = "Scissors";
		}	
	document.write("Computer's choice is " + computerChoice);
	var compare = function(choice1, choice2){
		if (choice1 === choice2){
			return "This 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";
			}
		}
	};
	compare(userChoice, computerChoice);

Answer 1

代码正确且工作正常，您只是忘记了展示它的重要部分。

您没有将结果写入实际文档。你调用该函数并正确返回，但你没有明显地显示答案。试试这段代码：

＆＃13;

var userChoice = prompt("What would you like to play?"),
    computerChoice = Math.random();
if (computerChoice <= 0.34){
    computerChoice = "Rock";
}
else if (computerChoice >= 0.35 && computerChoice <= 0.67){
		computerChoice = "Paper";
}
else {
	computerChoice = "Scissors";
}	
document.write("Computer's choice is " + computerChoice);
var compare = function(choice1, choice2) {
	if (choice1 === choice2){
		return "This 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";
		}
	} 
    else {
        return "Invalid input! Type either rock, paper, or scissors!"
    }
};

document.write(", " + compare(userChoice, computerChoice));

＆＃13;

您错过了最后一个document.write将结果写入文档。你可以自己格式化。如果输入有效，我还建议添加另一个案例。如果输入有效，您也可以将主提示放在函数中并调用递归。

代码没有给出任何返回字符串

1 个答案: