百度地图IP定位，点击地图添加marker

<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>
	<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script>
	<title>IP定位获取当前城市</title>
</head>
<body>
	<div id="allmap"></div>
</body>
</html>
<script type="text/javascript">
	// 百度地图API功能
	var map = new BMap.Map("allmap");
	var point = new BMap.Point(117.27051,31.836904);
	map.centerAndZoom(point,12);

	function myFun(result){
		var cityName = result.name;
		map.setCenter(cityName);
 		alert("当前定位城市:"+cityName);
	}

	var myCity = new BMap.LocalCity();
	myCity.get(myFun);

	map.addEventListener('click', function(e) {
        var marker = new BMap.Marker(new BMap.Point(e.point.lng, e.point.lat))
         map.addOverlay(marker)
       })
</script>