高德地图 js自动定位到当前城市

showCityInfo();
 //自动定位当前位置
    function showCityInfo() {
        //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 citybounds = result.bounds;
                    //地图显示当前城市
                    map.setBounds(citybounds);
                }
            } else {
                document.getElementById('info').innerHTML = result.info;
            }
        });
    }