高德地图获取当前城市&输入提示

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>高德地图获取当前城市&输入提示</title>
    <script type="text/javascript" src="http://webapi.amap.com/maps?v=1.4.15&key=943991f38e4aec19029d284ff4ffac9c&plugin=AMap.CitySearch,AMap.Autocomplete,AMap.PlaceSearch"></script>
</head>
<body>
<div id="amapInp">
    <input id="tipinput"/>
</div>
<script type="text/javascript">
	//异步方法
	Promise.prototype.finally = function (callback) {
		var P = this.constructor;
		return this.then(
			function(value){
				P.resolve(callback()).then(function(){
					return value
				})
			},
			function(reason){
				P.resolve(callback()).then(function(){
					throw reason
				})
			}
		);
	};
    //获取用户所在城市信息
    function showCityInfo() {
		return new Promise(function (resolve, reject) {
			var res;
			//实例化城市查询类
	        var citysearch = new AMap.CitySearch();
	        //自动获取用户IP，返回当前城市
	        citysearch.getLocalCity(function(status, result) {
	            if (status === 'complete' && result.info === 'OK') {
	                if (result && result.city && result.bounds) {
	                    var cityinfo = result.city;
	                    var citybounds = result.bounds;
	                    res = cityinfo;
	                }
	            } else {
	                res = result.info;
	            }
				resolve(res);
	        });
		});
    }
    showCityInfo().then(function(res){
		console.log('当前城市->',res);
		//输入提示
	    var autoOptions = {
	        city: res,
	        input: "tipinput"
	    };
	    var auto = new AMap.Autocomplete(autoOptions);
	    //构造地点查询类
	    AMap.event.addListener(auto, "select", select);//注册监听，当选中某条记录时会触发
	    function select(e) {
	      console.log(e.poi.district,e.poi.address,e.poi.name);
	    }
	});
</script>
</body>
</html>