尝试创建一个简单的多项选择游戏答案

【问题标题】：Trying to create a simple Multiple Choice game尝试创建一个简单的多项选择游戏
【发布时间】：2012-12-23 00:57:55
【问题描述】：

我列出问题和选项的功能不起作用。我不断收到错误代码document.getElementById(...) 为空或不是对象。语法似乎是正确的。

我希望问题和选择出现在同一个 div 中。我不想一次列出我所有的问题。当用户完成一个问题时，他们会继续下一个问题，该问题将出现在与第一个问题完全相同的 div 中，直到所有问题都被看到。

<script>

var questions = new Array();
questions[0] = 'Is there a difference between a jungle and a rain forest?'
questions[1] = 'What is the world\'s most common religion?',
questions[2] = 'What is the second largest country (in size) in the world?';

var choices = new Array();
choices[0] = ['No difference', 'Some difference', 'Completely different'],
choices[1] = ['Christianity', 'Buddhism', 'Hinduism', 'Islam'],
choices[2] = ['USA', 'China', 'Canada', 'Russia'];

var answers = new Array();
answers[0] = ['Some difference'],
answers[1] = ['Christianity'],
answers[2] = ['Canada'];

var score = 0;
i= 0;

var listQuestion = function(){  
    if( i < questions.length ){
        document.getElementById("myDiv1").innerHTML = '<p>'+questions[i]+'</p>';
        for (k=0; k<choices[i].length; k++){
            document.getElementById("myDiv2").innerHTML ='<p><input type = "radio" name = "questionchoice">'+choices[i][k]+'</p>';
        }
        document.getElementById("myDiv3").innerHTML = '<p><button onClick = "getRadioValue()">Check</button></p> <br>';
    };
};

var getRadioValue = function(){
    for ( var h = 0; h < document.getElementsByName('questionchoice').length; h++ ){
        var value = '';
        if (document.getElementsByName('questionchoice')[h].checked==true){
            value = document.getElementsByName('questionchoice')[h].value;
            score+=1
        }
    }
    if (value== answers[i]){
        document.getElementById("myDiv4").innerHTML ="That is correct. </br><button input type = 'submit' onClick = 'loadContent()'> Next Question</button>";   
    }
    else {
        document.getElementById("myDiv4").innerHTML ="That is incorrect. </br><button input type = 'submit' onClick = 'loadContent()'> Next Question</button>"; 
    }
    i++;
};

var whatIsScore = function(){
    return score; 
}

window.onload = listQuestion();

</script>

</head>

<body>
    <div id="myDiv1"></div> 
    <div id="myDiv2"></div>
    <div id="myDiv3"></div>
    <div id="myDiv4"></div>
</body>

【问题讨论】：

你有任何 HTML 来配合它吗？您应该在页面上的某个位置至少有四个 <div> 元素具有 id 值； myDiv1，myDiv2，myDiv3，myDiv4。
嗨，戴夫，我愿意。见下文。
您能否将您的完整来源添加到问题中，以便我们重新创建您的错误。它找不到您的元素，而您正试图访问 null 对象的 innerHTML 属性。

标签： javascript for-loop innerhtml getelementbyid radio-group

【解决方案1】：

这里是完整的代码：

<!DOCTYPE html>
<html>
<head>

<script>
var questions = new Array();
questions[0] = 'Is there a difference between a jungle and a rain forest?';
questions[1] = 'What is the world\'s most common religion?',
questions[2] = 'What is the second largest country (in size) in the world?';

var choices = new Array();
choices[0] = ['No difference', 'Some difference', 'Completely different'],
choices[1] = ['Christianity', 'Buddhism', 'Hinduism', 'Islam'],
choices[2] = ['USA', 'China', 'Canada', 'Russia'];

var answers = new Array();
answers[0] = ['Some difference'],
answers[1] = ['Christianity'],
answers[2] = ['Canada'];

var score = 0;
i= 0;

var listQuestion = function(){  
    if(i<questions.length){
        document.getElementById("myDiv1").innerHTML = '<p>'+questions[i]+'</p>';
        var choicesOutput=[];//new Array()
        for (var k=0; k<choices[i].length; k++){
            choicesOutput.push(
                '<p><input type = "radio" name ='
                +' "questionchoice">'+choices[i][k]+'</p>');
        }
        document.getElementById("myDiv2").innerHTML =choicesOutput.join("");
        document.getElementById("myDiv3").innerHTML = 
            '<p><button onClick = "getRadioValue()">Check</button></p> <br>';
    }
};
var getRadioValue = function(){
    var value = '';
    for (var h = 0; 
        h < document.getElementsByName('questionchoice').length; h++){
        if (document.getElementsByName('questionchoice')[h]
            .checked==true){
            value = document.getElementsByName('questionchoice')[h].value;
            score++;
        }
    }
    if (value== answers[i]){
        document.getElementById("myDiv4").innerHTML =
            "That is correct. </br><button input type = "
            +"'submit' onClick = 'loadContent()'> Next Question</button>";
    }
    else {
        document.getElementById("myDiv4").innerHTML ="That is incorrect. "
           +"</br><button input type = 'submit' onClick = 'loadContent()'> N"
           +"ext Question</button>"; 
    }
    i++;
};
var whatIsScore = function(){
    return score; 
};
function loadContent(){
    document.getElementById("myDiv4").innerHTML="";
    listQuestion();
}
window.onload = listQuestion;
</script>
</head>
<body>
<div id="myDiv1"></div> 
<div id="myDiv2"></div>
<div id="myDiv3"></div>
<div id="myDiv4"></div>
</body>
</html>

【讨论】：

仍然收到此错误消息：'document.getElementById(...)' is null or not an object
如果您发布完整的页面，我可以为您查看。如果错误是在尝试通过其 id 获取 myDiv3 的行上触发的，并且该元素不存在或没有 id（区分大小写），那么您将收到此类错误。我看到我使用了错误的 ID 作为答案，我使用了 myDiv3 而不是 myDiv2。会改正的
嗨 HMR，我已经发布了上面的所有代码。当我使用你的代码时，我得到了同样的错误信息（上面列出的），所以我决定发布我的原始代码。您可以提供的任何帮助将不胜感激。谢谢。
大家好，你好运吗？我被难住了。
window.onload=listQuestion() 应该是：window.onload=listQuestion.