首先,我知道这远非专业.我正在努力学习如何使用字符串.这个应用程序应该做的是采用简单的文本输入并用它做一些事情:
计数字母,计数大写和小写字母,计数单词和计数空格.这就是我所做的:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Case Check</title>
<script type="text/javascript">
function checkCase(text)
{
var counter = 0;
var letters = 0;
var lowercase = 0;
var uppercase = 0;
var spaces = 0;
var words = 0;
for(; counter < text.length; counter++)
{
if(isUpperCase(text.charAt(counter))) {uppercase ++; letters++;}
if(isLowerCase(text.charAt(counter))) {lowercase ++; letters++;}
if((text.charAt(counter) == " ") && (counter < text.length))
{
spaces += 1;
words += 1;
}
if((text.charAt(counter) == ".") || (text.charAt(text(counter)) == ",")) continue;
}
return [letters, lowercase, uppercase, spaces, words];
}
function isUpperCase(character)
{
if(character == character.toUpperCase) return true;
else return false;
}
function isLowerCase(character)
{
if(character == character.toLowerCase) return true;
else return false;
}
</script>
</head>
<body>
<script type="text/javascript">
var typed = prompt("Enter some words.");
var result = checkCase(typed);
document.write("Number of letters: " + result[0] + "br /");
document.write("Number of lowercase letters: " + result[1] + "br /");
document.write("Number of uppercase letters: " + result[2] + "br /");
document.write("Number of spaces: " + result[3] + "br /");
document.write("Number of words: " + result[4] + "br /");
</script>
</body>
根据用户的建议做了一些更改.现在的问题是它不会让我像对象一样对待'text'.
MrJ*_*MrJ 12
使用正则表达式.
例
var s = "thisIsAstring";
var numUpper = s.length - s.replace(/[A-Z]/g, '').length;
// numUpper = 2
您可以使用match（）和正则表达式。
var str = "aBcD";
var numUpper = (str.match(/[A-Z]/g) || []).length; // 2
不确定是否是整个问题，但这个问题有问题
if(text.charAt(letters)) == " " && text(letters) < text.length)
^
应该
if(text.charAt(letters) == " ") && text(letters) < text.length)
^
事实上我会成功的
if((text.charAt(letters) == " ") && (text(letters) < text.length))
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