字符串中连续的第一组三个数字

2023-06-16 10:29:54

function captureThreeNumbers(str) {
  let res = ''
  for (let i = 0; i < str.length; i++) {
    if (
      Number(str[i] + 1) === Number(str[i + 1]) &&
      Number(str[i] + 2) === Number(str[i + 2])
    ) {
      console.log('升序')
      res = str[i] + str[i + 1] + str[i + 2]
      return res
    } else if (
      Number(str[i] - 1) === Number(str[i + 1]) &&
      Number(str[i] - 2) === Number(str[i + 2])
    ) {
      console.log('降序')
      res = str[i] + str[i + 1] + str[i + 2]
      return res
    }
  }
}

// console.log(captureThreeNumbers('9876543'))