看了下源码，应该是，[ScrollableLegendView.js#353](https://github.com/apache/incubator-echarts/blob/master/src/component/legend/ScrollableLegendView.js#L351)这个赋值有点问题，不过代码有点多，没理透，希望@pissang 能否给个临时解决方案
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