Javascript

Question

这是我第一次学习编程 Javascript 并且一直在研究这个程序，在墙上喝 99 杯饮料直到它达到零。我从凌晨 12 点开始学习 JS 就开始研究这个程序......它的现在凌晨 3 点，我疯了，看不出我的错误。

我哪里错了？我以后如何防止这种情况发生？

这是我第一次制作 JS 程序，所以请不要对我太过苛刻，我刚刚打开一本书，从 11:30pm 开始，直到现在凌晨 3 点才问..

谢谢大家！

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>My First JavaScript</title>
</head>
<body>
<script>
var drinks = "Energy Drink";
var lyrics = "";
var cans = 99;
    while (cans > 0) {

      lyrics = lyrics + cans + " cans of " + drinks + " on the 
      wall <br>";
      lyrics = lyrics + cans + " cans of " + drinks + "<br>";
      lyrics = lyrics + " Take on down pass it around, <br>";
      
      if (cans > 1)
        {
        lyrics = lyrics + (cans-1) + " cans of " + drink + " on 
        the wall <br>"
        }

     ** else *This is where my error seems to come from????*
        {
        lyrics = lyrics + "No more cans of " + drink + " on the 
        wall <br>";
        }
      cans = cans - 1;
    }
    document.write(lyrics);
</script>

</body>
</html>

Answer 1

  var drinks = "Energy Drink";
  var lyrics = "";
  var cans = 99;
  while (cans > 0) {

    lyrics = lyrics + cans + " cans of " + drinks + " on the wall <br>";
    lyrics = lyrics + cans + " cans of " + drinks + "<br>";
    lyrics = lyrics + " Take on down pass it around, <br>";
    
    if (cans > 1) {
      lyrics = lyrics + (cans-1) + " cans of " + drinks + " on the wall <br>";
    } else {
      lyrics = lyrics + "No more cans of " + drinks + " on the wall <br>";
    }
    cans = cans - 1;
  }
  document.write(lyrics);

你在 vars 中换行了。

你写 drink 而不是 drinks

将 <script> 更改为 <script type="text/javascript">

Answer 2

谢谢各位大佬！事实证明我的代码不起作用，因为我没有在 IF/ELSE 语句中将 s 添加到“drink”。我有一个变量拼写错误导致代码无法打印。

Javascript - Uncaught SyntaxError: Unexpected token 'else'

Javascript - Uncaught SyntaxError: Unexpected token 'else'

arrays

if-statement

var

syntax-error