/**
 * 动态加载百度地图api函数
 * @param {String} ak  百度地图AK，必传
 */
export default function loadBMap(ak) {
  return new Promise((resolve, reject) => {
    if (typeof window.BMap !== "undefined") {
      resolve(window.BMap);
      return true;
    }
    window.onBMapCallback = function() {
      resolve(window.BMap);
      return true;
    };
    const script = document.createElement("script");
    script.type = "text/javascript";
    script.src =
      `"http://api.map.baidu.com/api?v=3.0&ak=PM43nB8eDNTBrXkQwGrTQFcmOni3Z9nO"`;
    script.onerror = reject;
    document.head.appendChild(script);
    return true;
  });
}

