export function MP(ak) {
  return new Promise(function (resolve, reject) {
    //判断地图是否定义没
    if(typeof BMap !== "undefined"){
      resolve(BMap)
      return true
    }
	  window.init = function () {
	        resolve(BMap)
	  }
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "https://api.map.baidu.com/api?v=2.0&ak="+ak+"&callback=init";
    script.onerror = reject;
    document.head.appendChild(script);
    
  })
}