this.mapCtx.addGroundOverlay({

      id: 10086,

      src: '/image/map.png',

      bounds: {

        southwest: { //西南角经纬度

          latitude: 22.57752841911238,

          longitude: 114.04844556792409

        },

        northeast: { //东北角经纬度

          latitude: 22.81703829138907,

          longitude: 114.36735410533367

        }

      },

      success: res => {

        console.log(res, "图层创建成功");

      },

      fail: err => {

        console.log(err, "图层创建错误");

      }