输入: [0,1,0,3,12]
输出: [1,3,12,0,0]

var moveZeroes = function (nums) {
  let zeros = []
  for (let i = 0; i < nums.length; i++) {
    if (nums[i] === 0) {
      zeros.push(i)
    }
  }
  for (let j = zeros.length - 1; j >= 0; j--) {
    nums.splice(zeros[j], 1)
  }
  for (let j = 0; j < zeros.length; j++) {
    nums.push(0)
  }
  return nums
}

var moveZeroes = function (nums) {
  let j = 0

  for (let i = 0; i < nums.length; i++) {
    if (nums[i] !== 0) {
      nums[j] = nums[i]
      j++
    }
  }

  while (j < nums.length) {
    nums[j] = 0
    j++
  }
}

var moveZeroes = function (nums) {
  let j = 0

  for (let i = 0; i < nums.length; i++) {
    if (nums[i] !== 0) {
      swap(nums, i, j)
      j++
    }
  }
}

function swap(nums, i, j) {
  let temp = nums[i]
  nums[i] = nums[j]
  nums[j] = temp
}