openlayers地图显示点

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <title></title>
    <link rel="stylesheet" href="lib/OpenLayers/ol.css" type="text/css">

    <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
    <script src="lib/OpenLayers/ol.js"></script>
    <script src="olStyle/Light.js"></script>
    <style>
        html,
        body {
            width: 100%;
            height: 100%;
            margin: 0;
        }

        .map {
            width: 100%;
            height: 100%;
            background: #f6f6f4;
        }
    </style>
</head>

<body>
    <div id="map" class="map" data-id="11"></div>
    <script type="text/javascript">  

        $(function () {

            InitMap();

            AddPolygon();
        })

        var map;
        var layer;

        //地图初始化
        function InitMap() {
            //初始化地图
            layer = new ol.layer.Vector({
                source: new ol.source.Vector(),
                    overlaps: false,
                    wrapX: false
                }),
                style: function (feature, resolution) {
                    switch (feature.get('layer')) {
                        case 'poi':
                            poiStyle.getText().setText(feature.get('name'));
                            return poiStyle;
                        case 'boundary': return boundaryStyle;
                        case 'lawn': return lawnStyle;
                        case 'road':
                            roadStyle.getText().setText(feature.get('name'));
                            return (resolution < 2) ? roadStyle : null;
                        case 'building':
                            return buildingStyle(feature, resolution);
                        case 'other':
                            otherStyle.getText().setText(feature.get('name'));
                            return otherStyle;
                        default: return null;
                    }
                }
            });

            map = new ol.Map({
                layers: [layer],
                target: 'map',
                view: new ol.View({
                    center: ol.proj.fromLonLat([120.277, 36.330]),
                    minZoom: 1,
                    zoom: 16
                })
            });
        }

        /*显示并编辑区域**********************************************************************************/


        function createLabelStyle(feature) {
            //返回一个样式
            return new ol.style.Style({
                //把点的样式换成ICON图标
                fill: new ol.style.Fill({
                    //填充颜色
                    color: 'rgba(37,241,239,0.2)'
                }),
                //图形样式，主要适用于点样式
                image: new ol.style.Circle({
                    //半径大小
                    radius: 7,
                    //填充
                    fill: new ol.style.Fill({
                        //填充颜色
                        color: '#e81818'
                    })
                }),
                //层
                zIndex: 20
            });
        };

        function AddPolygon() {

            var coordinate = ol.proj.fromLonLat([120.277, 36.330]);

            var newFeature = new ol.Feature({
                geometry: new ol.geom.Point(coordinate)
            });

            //设置点的样式
            newFeature.setStyle(createLabelStyle(newFeature));

            //清楚坐标点
            //layer.getSource().clear();

            //将当前要素添加到矢量数据源中
            layer.getSource().addFeature(newFeature);
        }



    </script>
</body>

</html>
openlayers地图显示点

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