Ovilia commented on issue #10636: 自定义 sector emphasis无效 URL: https://github.com/apache/incubator-echarts/issues/10636#issuecomment-500289151 发现其实是文档写得不是很好，正确的写法是，如果在 `data.emphasis.itemStyle` 中定义了样式，需要在 `renderItem` 中定义 `styleEmphasis: api.styleEmphasis()`，如： ```js function renderItem(params, api) { // ... return rectShape && { type: 'rect', shape: rectShape, style: api.style(), styleEmphasis: api.styleEmphasis() }; } ``` 此外，还可以直接在 `renderItem` 中定义高亮样式，如： ```js function renderItem(params, api) { // ... return rectShape && { type: 'rect', shape: rectShape, style: api.style(), styleEmphasis: { color: 'red' } }; } ``` 之后我会改进一下文档。
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