利用 高阶函数 | 作用域 | 配置初始化脚本 的全局变量

import context from ‘@utils/context‘;


const configFileUrl = `http://sgs.com/api`;

const timtOut = proObj => {
  return Promise.race([
    proObj,
    new Promise(resolve => {
      setTimeout(() => {
        resolve({ code: 1001, errMsg: ‘接口请求超时，时限3秒‘ });
      }, 3000);
    })
  ]);
};
const fetchApiPro = requestPromise({ url: configFileUrl });
const h_fetchConfigFile = () => {
  let apiData = null;
  fetchApiPro.then(res => (apiData = res));
  return () => apiData;
};

const output = {
  init() {
    this._getConfigFile = h_fetchConfigFile();
  },
  getPreSaleConfig: async function () {
    const { preSaleListConfig } = this;
    if (preSaleListConfig) {
      return preSaleListConfig;
    }
    let res;
    try {
      res = await timtOut(fetchApiPro);
    } catch (e) {
      res = { code: 1001, errMsg: e };
    }
    return res;
  },
  get preSaleListConfig() {
    return output._getConfigFile();
  }
};
export default output;