option = {
  ...
  toolbox: {
    show:true,
    feature: {
      dataZoom: {
        yAxisIndex: 'none'
      },
      dataView: {readOnly: false},
      magicType: {type: ['line', 'bar']},//折线图、柱状图切换
      restore: {},//恢复，即刷新图表
      saveAsImage: {}//保存为图片
    }
  },
  ...
}