vue2 多个数组如何按照要求合并成一个数组？

固定数组解法：

  const a = [1, 2, 3, 4, 5];
  const b = ['a', 'b', 'c'];
  const c = ['A', 'Z'];
  const result = [];
  for (let aItem of a) {
    for (let bItem of b) {
      for (let cItem of c) {
        result.push('' + aItem + bItem + cItem);
      }
    }
  }
  console.log(result);

任意数组解法：

const demo=function(...args) {
  const result = [];
  const arrays = args.filter(arg => arg.length);
  build(arrays, 0, '', result);
  console.log(result);
};
const build=function (arrays, index, str, result) {
  const array = arrays[index++];
  if (!array) {
    result.push(str);
    return;
  }
  for (let item of array) {
    build(arrays, index, str + item, result);
  }
}