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`next_permutation`是一个全排列功能的函数，可以接收一个字符串s和数字n，可以返回s在全排列中的n步后的字符串（如果已到最后一个排列，则返回最后一个）
louwknext_permutation是一个全排列功能的函数，可以接收一个字符串s和数字n，可以返回s在全排列中的n步后的字符串（如果已到最后一个排列，则返回最后一个）
npm install -S next_permutationconst NextPermutation = require('next_permutation')
let startStr = '123'
let res = NextPermutation(startStr, 1)
console.log(res) // '132'