const getNarcissisticNumbers = function (n) {

     let min = Math.pow(10, n - 1) - 1

     let max = Math.pow(10, n)

     let res = []

     for (let i = min; i < max; i++) {

         let arr = (i + '').split('')

         let sum = 0

         for (let j = 0; j < arr.length; j++) {

             sum += Math.pow(arr[j], n)

         }

         if (sum === i) {

             res.push(i)

         }

     }

     return res

 }

 getNarcissisticNumbers(1)

 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]