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执行JavaScript

[英]execution of JavaScript

您能否帮助我了解代码的问题以及为什么单击按钮后按钮不起作用? 我相信我错过了一小部分,但找不到。

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Conditions</title>
    <link href="css/styles.css" rel="stylesheet">
    <script>
        function AgeCh 
    {
    var Age = prompt("Please enter your age here","from 4 to 100");

        if (Age >= 16) 
        {
    document.write("You are old enough to drive.");
        } 
        else if (Age >=21) 
        {
    document.write("You are old enough to drive and vote.");
        } 
        else if (Age >=65)
        {
    document.write("You are old enough to drive, vote and retire.");
        }
        else 
        {
            document.write ("thinks");
        }
}
    </script>
</head>

<body>


    <div class="classselector">

  <button type = "button" onclick="AgeCh()">Age Checker</button>

    </div>



</body>

</html>

我非常感谢您的帮助。 我真的不知道为什么javascript在这里不起作用。

您在AgeCh中丢失() 函数应定义为AgeCh()

更正的代码:

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Conditions</title>
    <link href="css/styles.css" rel="stylesheet">
    <script>
        function AgeCh() 
    {
    var Age = prompt("Please enter your age here","from 4 to 100");

        if (Age >= 16) 
        {
    document.write("You are old enough to drive.");
        } 
        else if (Age >=21) 
        {
    document.write("You are old enough to drive and vote.");
        } 
        else if (Age >=65)
        {
    document.write("You are old enough to drive, vote and retire.");
        }
        else 
        {
            document.write ("thinks");
        }
}
    </script>
</head>

<body>


    <div class="classselector">

  <button type = "button" onclick="AgeCh()">Age Checker</button>

    </div>



</body>

</html>

定义函数似乎是一个错误。 我使用let AgeCh = function() {}重新定义了您的函数,这似乎可以使您的函数正常工作。

https://plnkr.co/edit/rHBbofiwvO55bCLDA4jg?p=preview

函数文档: https : //developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Functions

是的,请检查您的函数声明是否错误

 function AgeCh 
  {

改成

function AgeCh()
{

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