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({

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