Question

我的课程作业是创建一个网页，提示用户他们的年龄，然后决定该用户是否年龄太大/年轻，无法使用AND和OR运算符在青少年运动队中进行游戏。

需要2个功能，每个功能都由自己的按钮调用。一个调用使用AND运算符确定合格性的函数，另一个调用使用OR运算符的函数。

在其他作业中，我没有问题提示用户输入和使用该输入，但每次我尝试在我的函数中使用if语句时，网页就好像没有发生任何事情，当我点击按钮来调用这些功能。

以下代码粘贴：

<html lang="en"> 
<head>
  <meta charset="utf-8">
  <link rel="stylesheet" href="style.css">

  <title>Aaron Stockdale's Age Range Page</title>
  <script type="text/javascript">
     function andFunction()             
     {
        var userAge = prompt("What's your age?", " ");

        if(userAge >= 16 && userAge <= 18)
          document.getElementById('age').innerHTML = "Age entered " + userAge + "is in range. Can play in youth team.";}
        else
          document.getElementById('age').innerHTML = "Age entered " + userAge + "is not in range. Can play not in youth team.";}

     }

     function orFunction()              
     {
        var userAge = prompt("What's your age?", " ");

        if(userAge > 15 || userAge < 19)
          document.getElementById('age').innerHTML = "Age entered " + userAge + "is in range. Can play in youth team.";}
        else
          document.getElementById('age').innerHTML = "Age entered " + userAge + "is not in range. Can play not in youth team.";}

     }

  </script>
</head>

<body>


    <header>
        <h1>Aaron Stockdale's Age Range Check</h1>
    </header>




<section>   

    <br><p>This page will prompt Aaron for his age to check if he can play in the youth team.</p>

    <h2>Click on the button below to enter Aaron's age</h2>

    <p><input type="button" id="button1" style="border:2px solid #6A959D" value="Enter age and compare with AND operator"
        onclick="andFunction()"/>

    <p><input type="button" id="button1" style="border:2px solid #6A959D" value="Enter age and compare with OR operator"
        onclick="orFunction()"/>

</section>


</body>
</html>

Answer 1

你在if和else语句的末尾添加}但没有{打开它们

更改为

if(userAge >= 16 && userAge <= 18) {
      document.getElementById('age').innerHTML = "Age entered " + userAge + "is in range. Can play in youth team.";}
    else {
      document.getElementById('age').innerHTML = "Age entered " + userAge + "is not in range. Can     play not in youth team.";}

Answer 2

除了{没有{，

你有if(userAge > 15 || userAge < 19)

如果有人年龄超过15岁，或者年龄小于19岁，他们可以参加比赛。所以一个4岁的孩子可以，因为他低于19岁，而一个30岁的孩子也可以，因为他超过15岁......

插入if语句时函数不执行

2 个答案: