字符串中的特定字符数

Question

So guys, I want to make a specific character counter, fg in word Specific we have 2 "i".伙计们，我想做一个特定的字符计数器，fg 在单词 Specific 中我们有 2 个“i”。 Where am I wrong?我哪里错了？

function countChar(word, char) {
  var count = 0
  for (let i = 0; i <= word.lenght; i++) {
    if (word[i] === `${char}`) {
      count += 1
    }
  }
  return count;
}
console.log(countChar("BBC","B"));
//0
//undefined

Answer 1

Hi and welcome to stackoverflow!您好，欢迎来到 stackoverflow！

You have two problems in your code:您的代码中有两个问题：

typo word.length instead of word.lenght打字错误 word.length 而不是 word.lenght
word[i] instead of string[i] in the comparison比较中的 word[i] 而不是 string[i]

So, your code works when you use因此，您的代码在您使用时有效

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
function countChar(word, char) {
  var count = 0
  for (let i = 0; i <= word.length; i++) {
    if (word[i] === `${char}`) {
      count += 1
    }
  }
  return count;
}
alert (countChar("BBC","B"));
</script>
</head>
<body>
</body>
</html>

Please use a debugger, like the ones that are contained in every modern browser in the future;-).请使用调试器，就像未来每个现代浏览器中包含的调试器一样；-)。

Answer 2

There is a typing mistake in for loop. for 循环中存在输入错误。 Write length instead of lenght.写长度而不是长度。

Here is working code这是工作代码

function countChar(word, char) {
    var count = 0
    for (let i = 0; i <= word.length; i++) {
        if (word[i] === `${char}`) {
            count += 1
        }
    }
    return count;
}
console.log(countChar("BBC","B"));

字符串中的特定字符数

问题描述

2 个解决方案

解决方案1
0 已采纳 2022-03-13 18:19:34

解决方案2
0 2022-03-13 18:23:27

字符串中的特定字符数

问题描述

2 个解决方案

解决方案1 0 已采纳 2022-03-13 18:19:34

解决方案2 0 2022-03-13 18:23:27

解决方案1
0 已采纳 2022-03-13 18:19:34

解决方案2
0 2022-03-13 18:23:27