javascript - Check whether Given number is happy or not -

this code check given number happy number. think trying wrong logic.

var num = 5239;  var sum = 0;  while (num > 0) {    sum += math.pow(num % 10, 2);    num = math.floor(num / 10);    console.log(num)  }  console.log(sum);  if (num == 0) {    alert("happy number")  } else {    alert("not happy number")  }

please correct me correct result.

https://jsfiddle.net/g18tsjjx/1/

if understood happy number is, should correct.

$(document).ready(function() {   var num = 1;   var = 0;   (i; < 10000; i++) {     num = newnumber(num);   }   num == 1 ? alert("it's happy number") : alert("it's not happy number"); });  function newnumber(num) {   var sum = 0;   var temp = 0;   while (num != 0) {     temp = num % 10;     num = (num - temp) / 10;     sum += temp * temp;   }   return sum; }