使用object来解决 完整代码如下: let base = {2: 'abc', 3: 'def', 4: 'ghi', 5: 'jkl', 6: 'mno', 7: 'pqrs', 8: 'tuv', 9: 'wxyz'}; //先将小写字母替换成数字 let str1 = str.replace(/[a-z]/g,&nbs...