1、添加透明度控制条

2、在export default的data中加入观测值

export default {  data() {    return {    opacity: 1}    }}

3、添加事件

var value = this.opacity;      this.leftLayer ? this.leftLayer.setOpacity(value) : "";

4、添加图层

leftLayer 即为图层 采用L.tileLayer.wms添加图层

var envLayer = L.tileLayer        .wms(Url, {          layers: layers,          format: "image/png",          transparent: true,          version: "1.3.0",          crs: L.CRS.EPSG3857        })        .addTo(map);

5、效果