283. Move Zeroes

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].

Note:
You must do this in-place without making a copy of the array.
Minimize the total number of operations.
这道题没啥说的，就按照最基础的思路来：
从第一个元素开始检查，是0就移除并加在末尾，索引不变；不是就将索引后移
当索引达到数组总长度减掉0的个数减一的时候就代表都移完了。

/**
 * @param {number[]} nums
 * @return {void} Do not return anything, modify nums in-place instead.
 */
var moveZeroes = function(nums) {
    var num = nums.length;
    var numOf0 = 0
    var i = 0;
    while (i