在 <p> 段落中使用 getElementById.innerHTML 在 Javascript 中显示变量值

showing variable value in <p> paragraph using getElementById.innerHTML in Javascript

本文关键字：innerHTML Javascript 显示 变量值 getElementById 段落中      更新时间：2023-09-26

我正在尝试使用Javascript编写二十一点代码，并在HTML页面中显示结果。我已经编写了逻辑，但是我无法使用

getElementById.innerHTML逐段显示结果。我不知道如何使它正确。你能帮我这个吗？我:(的时间不多了。代码如下： 

<!DOCTYPE html>
<html>
<title>Welcome to Blackjack</title>
<!--<link href="style.css" rel="stylesheet" type="text/css">
<!-- <script src="bj.js"></script> -->
<head>
<script>
var PlayerScore = 0;
var DealerScore = 0;
var Winner = "Nobody";
var AskAgain = true;
function random(maxValue)
{
 return Math.floor(Math.random() * maxValue) + 1;
}
function pickSuit()
{
 suit = random(4);
 if(suit == 1)
 return "Spades";
 if(suit == 2)
 return "Clubs";
 if(suit == 3)
 return "Diamonds";
 return "Hearts";
}
function cardName(card)
{
 if(card == 1)
 return "Ace";
 if(card == 11)
 return "Jack";
 if(card == 12)
 return "Queen";
 if(card == 13)
 return "King";
 return ("" + card);
}
function cardValue(card)
{
 if(card == 1)
 return 11;
 if(card > 10)
 return 10;
 return card;
}
function PickACard(strWho)
{
 card = random(13);
 suit = pickSuit();
 alert(strWho + " picked the " + cardName(card) + " of " + suit);
 return cardValue(card);
}
function Dealer()
{
 while(DealerScore < 17)
 {
 DealerScore = DealerScore + PickACard("Dealer");
 }
}
function User()
{
	PlayerScore = PlayerScore + PickACard("You");
}
function LookAtHands(Winner)
{
 if(DealerScore > 21)
 {
 alert("House busts! You win!");
 Winner = "You";
 }
 else
 if((PlayerScore > DealerScore) && (PlayerScore <= 21))
 {
 alert("You win!");
  Winner = "You";
 }
 else
 if(PlayerScore == DealerScore)
 {
 alert("Push!");
  Winner = "Tie";
 }
 else
 {
 alert("House wins!");
  Winner = "House";
 }
}
Dealer();
alert("Dealer's score is: " + DealerScore);
document.getElementById('DealerScore').innerHTML = DealerScore;
User();
alert("Your score is: " + PlayerScore);
document.getElementById("DealerScore").innerHTML = "Dealer's score is: " + DealerScore;
while (AskAgain == true )
{
	var answer = confirm("Do you want to draw a card?")
	if (answer == true)
	{
		User();
		alert("Your score is: " + PlayerScore);
	    document.getElementById("PlayerScore").innerHTML = "Your score is: " + PlayerScore;
		if (PlayerScore < 21)
			{AskAgain = true;}
		
		else 
			{AskAgain = false;}
	}
	else
	{
		AskAgain = false;
	}
}
LookAtHands();
 
</script>
</head>
<body>
<div><p>Welcome to our Blackjack Table!</p>
<p id="PlayerScore">Your Score is: </p>
<p id="DealerScore">Dealer's Score is: </p>
</div>
</body>
</html>

正如

@nnnnnn所提到的，当您的JS执行时，您的html标签甚至没有加载，因此出现了问题。请尝试以下操作来更正问题：

 <!DOCTYPE html>
<html>
<title>Welcome to Blackjack</title>
<!--<link href="style.css" rel="stylesheet" type="text/css">
<!-- <script src="bj.js"></script> -->
<head>
<script>
var PlayerScore = 0;
var DealerScore = 0;
var Winner = "Nobody";
var AskAgain = true;
function random(maxValue)
{
 return Math.floor(Math.random() * maxValue) + 1;
}
function pickSuit()
{
 suit = random(4);
 if(suit == 1)
 return "Spades";
 if(suit == 2)
 return "Clubs";
 if(suit == 3)
 return "Diamonds";
 return "Hearts";
}
function cardName(card)
{
 if(card == 1)
 return "Ace";
 if(card == 11)
 return "Jack";
 if(card == 12)
 return "Queen";
 if(card == 13)
 return "King";
 return ("" + card);
}
function cardValue(card)
{
 if(card == 1)
 return 11;
 if(card > 10)
 return 10;
 return card;
}
function PickACard(strWho)
{
 card = random(13);
 suit = pickSuit();
 alert(strWho + " picked the " + cardName(card) + " of " + suit);
 return cardValue(card);
}
function Dealer()
{
 while(DealerScore < 17)
 {
 DealerScore = DealerScore + PickACard("Dealer");
 }
}
function User()
{
    PlayerScore = PlayerScore + PickACard("You");
}
function LookAtHands(Winner)
{
 if(DealerScore > 21)
 {
 alert("House busts! You win!");
 Winner = "You";
 }
 else
 if((PlayerScore > DealerScore) && (PlayerScore <= 21))
 {
 alert("You win!");
  Winner = "You";
 }
 else
 if(PlayerScore == DealerScore)
 {
 alert("Push!");
  Winner = "Tie";
 }
 else
 {
 alert("House wins!");
  Winner = "House";
 }
}
</script>
</head>
<body>
<div><p>Welcome to our Blackjack Table!</p>
<p id="PlayerScore">Your Score is: </p>
<p id="DealerScore">Dealer's Score is: </p>
</div>
<script>
Dealer();
alert("Dealer's score is: " + DealerScore);
document.getElementById('DealerScore').innerHTML = DealerScore;

User();
alert("Your score is: " + PlayerScore);
document.getElementById("DealerScore").innerHTML = "Dealer's score is: " + DealerScore;

while (AskAgain == true )
{
    var answer = confirm("Do you want to draw a card?")
    if (answer == true)
    {
        User();
        alert("Your score is: " + PlayerScore);
        document.getElementById("PlayerScore").innerHTML = "Your score is: " + PlayerScore;
        if (PlayerScore < 21)
            {AskAgain = true;}
        else 
            {AskAgain = false;}
    }
    else
    {
        AskAgain = false;
    }
}
LookAtHands();
</script>
</body>
</html>

您的脚本在包含元素的文档之前加载。 将脚本括在：

window.onload=function() {
    //all of your JavaScript code
}
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