[LeetCode][JavaScript]Number of 1 Bits

https://leetcode.com/problems/number-of-1-bits/

Number of 1 Bits

Write a function that takes an unsigned integer and returns the number of ’1‘ bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11‘ has binary representation 00000000000000000000000000001011, so the function should return 3.

/**
 * @param {number} n - a positive integer
 * @return {number}
 */
var hammingWeight = function(n) {
    var res = 0;
    for (i = n; i !== 0; ){
        if(i % 2 === 1){
            res++;
        }
        i = parseInt(i / 2);
    }
    return res;
};