我的 JavaScript 函数由于某种原因无法正常工作

Question

出于某种原因，此功能无法正常工作并且不会弹出警告框，但我的代码与另一个正常运行的页面完全相同。我是不是漏掉了什么蠢东西？

<!DOCTYPE html>
<html>
<head>
  <title>What's my name?</title>
  <script>
    function whatsMyName() {
        var first = "firstname";
        var last = "lastname";
        alert("My name is"+" "first+" "+last);
    }
  </script>
</head>
<body>
  <button type="button" onclick=whatsMyName()>What's my name?</button>
  <br><br>
  <a href="index.html">Return</a>
</body>
</html>

Answer 1

应该是..

<button type="button" onclick="whatsMyName()">What's my name?</button>

还有alert("My name is"+" "+first+" "+last);

Answer 2

你似乎把引号搞砸了。

为您解决了这个问题：

<!DOCTYPE html>

<html>
<head>
  <title>What's my name?</title>
  <script>
    function whatsMyName() {
        var first = "Corey";
        var last = "LeBlanc";
        alert("My name is " + first + " " + last);
    }
  </script>
</head>
<body>
  <button type="button" onclick="whatsMyName();">What's my name?</button>
  <br><br>
  <a href="index.html">Return</a>
</body>
</html>

Answer 3

变化：

alert("My name is"+" "+first+" "+last); // missing "+" before "first"
<button type="button" onclick="whatsMyName()">What's my name?</button>

onclick="whatsMyName()"

Answer 4

两个错误：

变化： <button type="button" onclick=whatsMyName()>What's my name?</button>

收件人： <button type="button" onclick="whatsMyName()">What's my name?</button>

变化： alert("My name is"+" "first+" "+last);

收件人： alert("My name is"+" "+first+" "+last);

Answer 5

您需要在“..”中编写函数，并更改alert..如下

alert("My name is" + " " +first+ " " +last); 

<body>
  <button type="button" onclick = "whatsMyName()">What's my name?</button>
  <br><br>
  <a href="index.html">Return</a>
</body>

我的 JavaScript 函数由于某种原因无法正常工作

My JavaScript function is not working for some reason

javascript

function

alert