[GitHub] [incubator-echarts] sunqi128154 opened issue #8968: 折线图堆叠数据差距过大时,大数据线条颜色被小数据的覆盖

[GitHub]

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### One-line summary [问题简述]





### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]: 2.0
+ Browser version [浏览器类型和版本]: Chrome 68.0.3440.84
+ OS Version [操作系统类型和版本]: Deepin 15.7





### Expected behaviour [期望结果]
两条数据差距过大时,颜色发生混乱




### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {
    title: {
        text: '折线图堆叠'
    },
    tooltip: {
        trigger: 'axis'
    },
    legend: {
        data:['邮件营销','联盟广告','视频广告','直接访问','搜索引擎']
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    toolbox: {
        feature: {
            saveAsImage: {}
        }
    },
    xAxis: {
        type: 'category',
        boundaryGap: false,
        data: ['周一','周二','周三','周四','周五','周六','周日']
    },
    yAxis: {
        type: 'value'
    },
    series: [
        {
            name:'邮件营销',
            type:'line',
            stack: '总量',
            data:[60000, 90000, 776667, 76789, 678797, 678465, 76789]
        },
        {
            name:'联盟广告',
            type:'line',
            stack: '总量',
            data:[1, 2, 191, 234, 290, 330, 310]
        }
    ]
};

```




### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->




[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/8968 ]
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