openlayers之点，线，面(以城市，河流，省份为例，分别对应点线面)

kpst._this这里指向初始化的map

     // 设置标注样式函数

    function createStyle(name) {

      // 河流style

      var riverStyle = new Style({

        stroke: new Stroke({

          color: '#4e89d4',

          width: 2

        }),

        fill: new Fill({

          color: '#eee'

        })

      })

      // 省份style·

      var provinceStyle = new Style({

        stroke: new Stroke({

          color: '#4e89d4',

          width: 1

        }),

        fill: new Fill({

          color: '#eee'

        })

      })

      //城市style·

      if (name != '') {

        var cityStyle = new ol.style.Style({

          image: new ol.style.Circle({

            radius: 5,

            fill: new ol.style.Fill({

              color: '#05ab57',

            }),

            stroke: new ol.style.Stroke({

              color: '#05ab57',

              width: 1

            }),

          }),

          text: new ol.style.Text({

            textAlign: "center", // 位置

            textBaseline: "top", // 基准线

            font: "normal 12px 微软雅黑", // 文字样式

            text: name,

            fill: new ol.style.Fill({

              color: "#333",// 文本填充样式（即文字颜色)

            }),

            stroke: new ol.style.Stroke({

              color: "#Fff",

            }),

            zIndex: 9

          })

        })

      }

      return {

        riverStyle,

        provinceStyle,

        cityStyle

      }

    }

    //创建图层

    function creatlayer(name) {

      var layer

      if (name != 'city') {

        layer = new VectorLayer({

          name: name,

          source: new VectorSource({

            // 地图的坐标系是CGCS2000,json数据也要是CGCS2000

            features: (new GeoJSON()).readFeatures(require("../../assets/data/" + name + '.json'))

          }),

          style: createStyle()[name + 'Style']

        });

      } else {

        var features = (new GeoJSON()).readFeatures(require("../../assets/data/city.json"))

        for (let i = 0; i < features.length; i++) {

          const feature = features[i];

          feature.setStyle(createStyle(feature.get("NAME")).cityStyle)

        }

        layer = new VectorLayer({

          name: name,

          source: new VectorSource({

            features: features

          })

        })

      }

      kpst._this.addLayer(layer);

      return layer

    };

    // 将图层加载到地图，并将所加图层赋给地图的某个对象

    function layerFx(name) {

      kpst._this[name] = creatlayer(name)

    }

    // 将图层加载函数挂载到地图

    kpst._this.layerFx = layerFx
巴特西

openlayers之点，线，面(以城市，河流，省份为例，分别对应点线面)

kpst._this这里指向初始化的map

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