js 判断 数字数组 是否 连续

预期
[1,2,3,4,5] => true
[1,2,3,5,6] => false

代码

//判断一串数字是否是连续的
const isContinuityNum = (num: number[] | number) => {
  let array = [];
  if (num instanceof Array) {
    array = [...num];
  } else {
    array = Array.from(num.toString()); //转换为数组
  }

  let i = array[0];
  let isContinuation = true;
  for (let e in array) {
    if (array[e] != i) {
      isContinuation = false;
      break;
    }
    i++;
  }
  return isContinuation;
};

测试