水仙花数［js]

 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]