清除echart 上一时刻的数据

this.dialogVisible = false;
      for (var i = 0; i < this.option.series.length; i++) {
        this.option.series[i].data = [];
        this.option.series[i].name = "";
      }
      const chart1 = this.$refs.myMiddleChart;
      var myChart = echarts.init(chart1);
      myChart.setOption(this.option, true);