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echart折线图数据切换频繁显示异常多出一条线

image如动图所示


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  1. 每次切换时把echarts对象clear清除数据一下;
  2. 有可能切换过快,数据延时,追加了进去;
  3. 切换时延时几秒出来,加个转圈动画效果;

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