line.vue:148 [ECharts] DEPRECATED: itemStyle.emphasis has been changed to emphasis.itemStyle since 4

line.vue:148 [ECharts] DEPRECATED: itemStyle.emphasis has been changed to emphasis.itemStyle since 4.0

意思：emphasis 和 itemStyle是同级关系

错误写法

itemStyle: {
  emphasis: {   //鼠标经过时折点小圆圈样式
          borderColor: 'rgba(49, 206, 255, 1)',
          borderWidth: 2
        },
}

正确写法：把emphasis移动到和itemStyle同级

 emphasis: {   //鼠标经过时折点小圆圈样式
        borderColor: 'rgba(235,156,54,1)',
        borderWidth: 2
      },
 itemStyle: {
 
 }