vue+leaflet地图实现根据省份区域划分颜色渐变图

效果图
![](https://img-blog.csdnimg.cn/063cdd14e3844678a0aaf9a34bfeaea0.png

实现代码如下

let separatedColors = ['rgb(255, 153, 209)'];// 离散颜色，如效果图上的粉色
let maxVal = 300000;// 定义一个最大值
data.forEach((item) => {
    for (let i = 10; i > 0; i--) {
        if (item.us_year < maxVal * i) {
            item.opacity = i / 10;
        }
    }
});
// 该geojson文件为全国地理坐标数据，可通过[阿里云数据化可视平台](http://datav.aliyun.com/portal/school/atlas/area_selector#&lat=33.521903996156105&lng=104.29849999999999&zoom=4)获取
this.geojson = geojson;
if (this.fixedProvince) {
    geojson.features.forEach(item => {
        if (item.properties.name === this.fixedProvince) {
            this.geojson = item;
        }
    });
}
// 定义一个图层geoLayerGroup
this.geoLayerGroup = this.$L.geoJSON(this.geojson, {
    onEachFeature: (feature, layer) => {
        data.forEach((item) => {
            if (Number(item.adcode) === Number(feature.properties.adcode)) {
                feature.properties.value = item;
                feature.properties.opacity = item.opacity;
            }
        });
        feature.properties.color = separatedColors[0];
        layer.setStyle({
            stroke: false, // 取消边框
            color: feature.properties.color,
            fillOpacity: feature.properties.opacity// 默认0.2
        });
        layer.closeTooltip();
        if (this.labelLayer) {
            this.map.removeLayer(this.labelLayer);
        }
        if (feature.properties.value) {
        	// 点击某一个省份则展示该省份名称和数据的弹出框
            layer.bindPopup(`<div class="title">${feature.properties.name}</div>
            <div class="geo-span">${feature.properties.value}</div>
            `, { className: 'geoPopup' });
        }
        this.map.on('zoom', () => {
        	// 缩放地图弹出框消失
            layer.closePopup();
        });
    }
});
// 将颜色渐变图层添加到地图中
this.geoLayerGroup.addTo(this.map);