JS数字转数字数组，并倒叙排序

let num1 = 708
let arr = []
let str = String(num1)  //数字转字符串
for (let q=0; q<str.length; q++){
    arr[q] = str[q]  //字符串存入数组
}
console.log(arr)    //["7", "0", "8"]
let arrEnd = arr.reverse().map(Number)  //数组倒叙排序reverse()
console.log(arrEnd); //[8, 0, 7]