应用场景，在购买前，查询是否有购买权限。

    2. const handleGoodBuy = async ({ goodsSn, goodsBizNos, skuSn }) => {
    3.   Toast.loading();
    5.   try {
    6.     const isSingle = goodsBizNos.length === 1;
    7.     const responses = await Promise.all(goodsBizNos.map(goodsBizNo => courseService.checkPurchased(goodsBizNo)));
    8.     const current = responses.find(response => Object.keys(response).length > 0);
    9.     Toast.hide();
    10.     if (current) {
    11.       PreventPurchaseBox.show({ courseName: current.title, isSingle });
    12.       return false;
    13.     }
    14.     window.location.href = `/finance/course/cashier?goodsSn=${goodsSn}&skuSn=${skuSn}&flowId=${flowId}`;
    15.   } catch (error) {
    16.     Toast.show(error.message);
    17.   }
    18.   return true;
    19. };
    1. 将需要查询的对象goodsBizNos遍历，创建请求队列
    2. Promise.all，请求队列
    3. 在返回的responses（数组）中查找是否有异常数据，此时用find
    4. 处理第一个异常数据current