Question

该脚本应该带来正确或错误答案的Javascript警报，警报不会弹出。可能是什么问题呢？我有一种感觉，这是一个简单的解决方案，我似乎无法找到它。我已经验证了整个页面（这只是一个片段），它通过了验证。

   <script type="text/javascript">
    /* <![CDATA[ */
    /* ]]> */

    function scoreQuestion1(answer){
    if (answer == "a")
       window.alert("Correct Answer");
    if (answer == "b")
       window.alert("Incorrect Answer");
    if (answer == "c")
       window.alert("Incorrect Answer");
    if (answer == "d")
       window.alert("Incorrect Answer");
    }
    function scoreQuestion2(answer){
    if (answer == "a")
       window.alert("InCorrect Answer");
    if (answer == "b")
       window.alert("Incorrect Answer");
    if (answer == "c")
       window.alert("Correct Answer");
    if (answer == "d")
       window.alert("Incorrect Answer");
    }
    function scoreQuestion3(answer){
    if (answer == "a")
       window.alert("Incorrect Answer");
    if (answer == "b")
       window.alert("Correct Answer");
    if (answer == "c")
       window.alert("Incorrect Answer");
    if (answer == "d")
       window.alert("Incorrect Answer");

    function scoreQuestion4(answer){
    if (answer == "a")
       window.alert("Incorrect Answer");
    if (answer == "b")
       window.alert("Incorrect Answer");
    if (answer == "c")
       window.alert("Correct Answer");
    if (answer == "d")
       window.alert("Incorrect Answer");
     }  
    function scoreQuestion5(answer){
    if (answer == "a")
       window.alert("Incorrect Answer");
    if (answer == "b")
       window.alert("Incorrect Answer");
    if (answer == "c")
       window.alert("Incorrect Answer");
    if (answer == "d")
       window.alert("Correct Answer");
      } 


    </script>

</head>
<body>
                           <form action="" name="quiz">
                           <p><strong>1. How many natural elements are there?</strong></p><p>
                           <input type="radio" name="question1" value="a" onclick="scoreQuestion1('a')" />92<br />   <!-- correct answer-->
                           <input type="radio" name="question1" value="b" onclick="scoreQuestion1('b')" />113<br />
                           <input type="radio" name="question1" value="c" onclick="scoreQuestion1('c')" />103<br />
                           <input type="radio" name="question1" value="d" onclick="scoreQuestion1('d')" />88<br /></p>
                           <p><strong>2. If one kg of air is compressed from 1m3 to 0.5 m3, which of the following statements is true?</strong></p><p>
                           <input type="radio" name="question2" value="a" onclick="scoreQuestion2('a')" />The density is halved.<br />
                           <input type="radio" name="question2" value="b" onclick="scoreQuestion2('b')" />The mass is halved.<br />
                           <input type="radio" name="question2" value="c" onclick="scoreQuestion2('c')" />The density is doubled.<br />    <!--correct answer-->
                           <input type="radio" name="question2" value="d" onclick="scoreQuestion2('d')" />The mass is doubled.<br /></p>
                           <p><strong>3.  What is the acceleration due to gravity?</strong></p><p>
                           <input type="radio" name="question3" value="a" onclick="scoreQuestion3('a')" />980 m/s2<br />
                           <input type="radio" name="question3" value="b" onclick="scoreQuestion3('b')" />9.8 m/s2<br />   <!--correct answer-->
                           <input type="radio" name="question3" value="c" onclick="scoreQuestion3('c')" />98 m/s2<br />
                           <input type="radio" name="question3" value="d" onclick="scoreQuestion3('d')" />0.98 m/s2<br /></p>
                           <p><strong>4.  What is the SI unit of density?</strong></p><p>
                           <input type="radio" name="question4" value="a" onclick="scoreQuestion4('a')" />cm3/g<br />
                           <input type="radio" name="question4" value="b" onclick="scoreQuestion4('b')" />m3/kg<br />
                           <input type="radio" name="question4" value="c" onclick="scoreQuestion4('c')" />kg/m3<br />      <!--correct answer-->
                           <input type="radio" name="question4" value="d" onclick="scoreQuestion4('d')" />g/cm3<br /></p>
                           <p><strong>5.  Which of these has the highest density?</strong></p><p>
                           <input type="radio" name="question5" value="a" onclick="scoreQuestion5('a')" />Lead<br />
                           <input type="radio" name="question5" value="b" onclick="scoreQuestion5('b')" />Water<br />
                           <input type="radio" name="question5" value="c" onclick="scoreQuestion5('c')" />Mercury<br />
                           <input type="radio" name="question5" value="d" onclick="scoreQuestion5('d')" />Tungsten<br /></p>   <!--correct answer-->
                           </form>

Answer 1

您永远不会关闭scoreQuestion3的功能，这会导致解析错误。如果你解决了这个问题，它应该可行。

function scoreQuestion3(answer){
if (answer == "a")
   window.alert("Incorrect Answer");
if (answer == "b")
   window.alert("Correct Answer");
if (answer == "c")
   window.alert("Incorrect Answer");
if (answer == "d")
   window.alert("Incorrect Answer");
}

Working version at jsFiddle

Answer 2

你错过了一个关闭你的得分问题3。

你应该研究一些事情：

1）正确的缩进

如果你在下一层（就像这样）时缩进，那么当发生这类错误时就会变得更加明显。

function scoreQuestion3(answer){
  if (answer == "a")
    window.alert("Incorrect Answer");
  if (answer == "b")
    window.alert("Correct Answer");
  if (answer == "c")
    window.alert("Incorrect Answer");
  if (answer == "d")
    window.alert("Incorrect Answer");

  function scoreQuestion4()...

您可以立即看到它已经失控并相应地进行调整。

直接从那里得到的东西：

2）使用{bracket

if(answer=="a"){
  alert("Incorrect Answer");
}

虽然你可以省略它们，if语句只会使用下一行，但它变得不那么清楚了。

3）其他

我想这是在你的下一课，但代码可以大大简化为：

function scoreQuestion3(answer){
  if(answer=="a"){
    alert("Correct Answer!");
  }else{
    alert("Incorrect answer I'm afraid!");
  }
}

如果声明没有触发警报 - 表格/测验

2 个答案: