可以使用 `notMerge` 模式(setOption 的第二个参数为 `true`),能清除之前的 series。

`chart.setOption(option, true)`

参见:<http://echarts.baidu.com/api.html#echartsInstance.setOption>

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https://github.com/apache/incubator-echarts/issues/9008 ]
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