如何删除或销毁leaflet加载的图片（imageOverlay）

var url1 = "../public/previ/2018120220/20181203000000_H2S1_2D-PREVI_Lv1.png";
              var imageBounds1 = [[18.71912, 110.253023], [18.71912, 110.451683], [18.880675, 110.451683], [18.880675, 110.253023]];
              L.imageOverlay(url1, imageBounds1, {opacity: 0.8}).addTo(this.leafletMap);

把这个加载在地图上的图片销毁或者删除

//添加
var overlay = L.imageOverlay(imageUrl, imageBounds).addTo(map);
//删除
map.removeLayer(overlay);