在javascript中转换大写和小写 [英] convert uppercase and lowercase in javascript

问题描述

我想编写一个在 Javascript 中转换大写和小写的代码.

I want to make a code that converts uppercase and lowercase in Javascript.

例如，堆栈溢出."----> '堆栈溢出'

For example, 'Hi, Stack Overflow.' ----> 'hI, sTACK oVERFLOW'

我该怎么做?

推荐答案

您可以遍历每个字符，然后将其转换为大写字母，如果它是小写字母，则将其转换为大写字母或将其视为两者都不是(如果是逗号、冒号等):

You could run over each character, and then covert it to lowercase if it's in uppercase, to uppercase if it's in lowercase or take it as is if it's neither (if it's a comma, colon, etc):

str = 'Hi, Stack Overflow.';
res = '';
for (var i = 0; i < str.length; ++i) {
    c = str[i];
  if (c == c.toUpperCase()) {
    res += c.toLowerCase();
  } else if (c == c.toLowerCase()) {
    res += c.toUpperCase();
  } else {
    res += c;
  }
}

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