echarts地图如何放大

地图不能写dataZoom来放大缩小，一定要写在series里的zoom

$.get(
          'https://geo.datav.aliyun.com/areas_v3/bound/140000_full.json',
          function(geoJson) {
            myChart.hideLoading()
            echarts.registerMap('SX', geoJson)
            myChart.setOption({
              title: {
                text:
                  'Shanxi map （' + new Date().getFullYear().toString() + '）',
                subtext: 'Evaluation of municipal'
              },
              tooltip: {
                trigger: 'item',
                formatter: '{b}
{c} 个评价'
              },
              toolbox: {
                show: true,
                orient: 'vertical',
                left: 'right',
                top: 'center',
                feature: {
                  dataView: { readOnly: false },
                  restore: {},
                  saveAsImage: {}
                }
              },
              visualMap: {
                min: 1,
                max: 50,
                text: ['高', '低'],
                realtime: false,
                calculable: true,
                inRange: {
                  color: ['lightskyblue', 'yellow', 'orangered']
                }
              },
              series: [
                {
                  name: '山西省各市评价数',
                  type: 'map',
                  map: 'SX',
                  zoom: 1.2,  // 一定要写这里 .....
                  label: {
                    show: true
                  },
                  data: arr
                }
              ]
            })
          }
        )