[GitHub] [incubator-echarts] mya12321 opened issue #9084: Chart collapsed when set height of chart around 120px.

[GitHub]

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### One-line summary [问题简述]

Chart collapsed when set height of chart around 120px.



### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]: 4.2.0-rc.1
+ Browser version [浏览器类型和版本]: Google Chrome Version 69.0.3497.92
+ OS Version [操作系统类型和版本]: Linux version 4.18.7-1-default





### Expected behaviour [期望结果]

The same as in tutorials.

### 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: 'ECharts entry example'
        },
        tooltip: {},
        legend: {
          data:['Sales']
        },
        xAxis: {
          data: ["shirt","cardign","chiffon shirt","pants","heels","socks"]
        },
        yAxis: {},
        series: [{
          name: 'Sales',
          type: 'bar',
          data: [5, 20, 36, 10, 10, 20]
        }]
      }

```




### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
Using the same option as in tutorial, except for the size:
`<div id="main" style="width: 200px;height:120px;"></div>`
The result is like below: 
![screenshot_20180916_154129](https://user-images.githubusercontent.com/14355408/45594092-302edf80-b984-11e8-9de8-4400f62f22f8.png)





[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9084 ]
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