echarts地图geo组件退拽和缩放

this.chartMap.on('georoam', (params) => {
      let option = this.chartMap.getOption();//获得option对象
        let len = option.geo.length;
        if (params.zoom != null) { //捕捉到缩放时
          for (var i = 0; i < len; i++) {
            option.geo[i].center = option.geo[0].center;
            option.geo[i].zoom = option.geo[0].zoom;
          }
        } else {//捕捉到拖曳时

          for (var i = 0; i < len; i++) {
            option.geo[i].center = option.geo[0].center;
          }
        }
        this.chartMap.setOption(option);//设置option
})