//总感觉这么列出来有点傻 let str = 'abcdefghijklmnopqrstuvwxyz'; let book = { 2: 'abc', 3: 'def', 4: 'ghi', 5: 'jkl', 6: 'mno', 7: 'pqrs', 8: 'tuv', 9: 'wxyz' } while(line = readline()) { const arr = line.split(''); let newArr = arr.map((item) => { if(/[A-Z]/....