[GitHub] [echarts] Enzeeun opened a new issue #16779: [Bug] behavior of "areaStyle.opacity" is different from what doc describes?

[GitBox]

Enzeeun opened a new issue #16779:
URL: https://github.com/apache/echarts/issues/16779


   ### Version
   
   5.3.1
   
   ### Link to Minimal Reproduction
   
   _No response_
   
   ### Steps to Reproduce
   
   I tried the example from 
[echarts.apache.org](https://echarts.apache.org/examples/zh/editor.html?c=area-basic)
 .
   
   options as below:
   ```js
   option = {
     xAxis: {
       type: 'category',
       boundaryGap: false,
       data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
     },
     yAxis: {
       type: 'value'
     },
     series: [
       {
         data: [820, 932, 901, 934, 1290, 1330, 1320],
         type: 'line',
         areaStyle: {
           color: 'red',
           // opacity: 1,
         }
       }
     ]
   };
   ```
   
   ### Current Behavior
   
   <img width="758" alt="image" 
src="https://user-images.githubusercontent.com/100330514/160971522-727d92eb-6888-4d0b-a7ea-a431d3bf4293.png";>
   
   
   ### Expected Behavior
   
   <img width="395" alt="image" 
src="https://user-images.githubusercontent.com/100330514/160971663-fcb5b73e-fb2a-467c-b4c0-4105ae700771.png";>
   
   As doc says, default opacity should be 1 ? When I set opacity to 1, it 
behaves like this:
   
   <img width="732" alt="image" 
src="https://user-images.githubusercontent.com/100330514/160971878-d39ab94f-c497-44fe-b6f2-fe9224660e9d.png";>
   
   
   ### Environment
   
   ```markdown
   - OS: macOS Monterey
   - Browser:Chrome/98.0.4758.102
   ```
   
   
   ### Any additional comments?
   
   
我使用官网上的例子，areaStyle的透明度不设置时，好像默认带了透明度，但文档上面写的是1。其他地方，如axisPointer.shadowStyle就不出现这个现象。


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