echarts 解决“There is a chart instance already initialized on the dom”问题

解决办法：

在重复调用之前先销毁之前的echarts

 if (this.chart != null && this.chart != "" && this.chart != undefined) {
        this.chart.dispose(); //销毁
  }
 this.chart = this.$echarts.init(this.$el);
 this.chart.setOption(option);