[80] 删除有序数组中的重复项 II

/**
 * @param {number[]} nums
 * @return {number}
 */
var removeDuplicates = function (nums) {
  let i = 1;
  while (i < nums.length) {
    if (nums[i] === nums[i - 1]) {
      while (nums[i + 1] === nums[i]) {
        nums.splice(i + 1, 1)
      }
    }
    i++;
  }
};