异步.html

<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
	<style type="text/css">
	body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;font-family:"微软雅黑";}
	</style>
	<title>异步加载地图</title>
</head>
<body>
  <div id= "allmap"></div>
</body>
</html>
<script type="text/javascript">
function loadJScript()
{
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = "http://api.map.baidu.com/api?v=2.0&ak=n4GwrK01fIOnpEiDkz7wy5rO&callback=init";
  document.body.appendChild(script);

}
function init()
{
  var map = new BMap.Map("allmap");
  var point = new BMap.Point(116.404,39.915);
  map.centerAndZoom(point,13);
  map.enableScrollWheelZoom();
}
  window.onload = loadJScript;
  </script>