题解 | #字符串变形#

		function trans(s, n) {
            let arr = s.split(/\s/);
            let res = [];
            let temp;
            while (arr.length) {
                temp = arr.pop()
                temp = temp.split('')
                temp.forEach((word,i) => {
                    if (/[a-z]/.test(word)) {
                        temp[i] = word.toUpperCase()
                    }else if (/[A-Z]/.test(word)) {
                        temp[i] = word.toLowerCase()
                    }
                });
                res.push(temp);
                res.push(' ')
            }
            res.pop()
            res = res.toString().replace(/,/g,'')
            return res
        }
 
module.exports = {
    trans : trans
}