Ovilia commented on issue #9109: 柱状图可否定制一组数据不同颜色（根据正负值）
URL:
https://github.com/apache/incubator-echarts/issues/9109#issuecomment-423426828
issue 等文档改进后再关
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Ovilia commented on issue #9109: 柱状图可否定制一组数据不同颜色（根据正负值）
URL:
https://github.com/apache/incubator-echarts/issues/9109#issuecomment-423417112
@100pah 文档需要改进一下，写下支持函数形式，但是用到的地方比较多，我不太敢改。@100pah 麻烦改下？
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Ovilia commented on issue #9109: 柱状图可否定制一组数据不同颜色（根据正负值）
URL:
https://github.com/apache/incubator-echarts/issues/9109#issuecomment-423416890
```js
series: [{
type: 'bar',
data:[220, -182, 191, 234, -290, 330, 310],
itemStyle: {
color: fu
