[GitHub] GFwer opened a new issue #9014: 使用Safari在svg渲染模式下，rgba渐变的透明度值失效

[GitBox <gi...@apache.org>]

GFwer opened a new issue #9014: 使用Safari在svg渲染模式下，rgba渐变的透明度值失效
URL: https://github.com/apache/incubator-echarts/issues/9014
 
 
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   为了方便我们能够复现和修复 bug，请遵从下面的规范描述您的问题。
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   ### One-line summary [问题简述]
   使用Safari，在透明度设置值
   ```
   new echarts.graphic.LinearGradient(
                           0, 0, 0, 1,
                           [
                               { offset: 0, color: 'rgba(172,90,255,0.2)' },
                               { offset: 1, color: 'rgba(172,90,255,0)' }
                           ]
              )
   ```
   之后，无论是设置areaStyle还是直接设置color，在Safari上结果都好像是直接忽略的透明度的值，同时Chrome/FireFox 上都可以正常显示
   
   
   
   
   ### Version & Environment [版本及环境]
   + ECharts version [ECharts 版本]:4.1.0
   + Browser version [浏览器类型和版本]:Safari 11/Safari 12，Chrome 69 , FireFox 61
   + OS Version [操作系统类型和版本]:MacOs 10.13.6/MacOs 10.14 Beta
   
   
   
   
   
   ### Expected behaviour [期望结果]
   能够正常显示透明度
   
   
   ### 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": ""
     },
     "tooltip": {
       "trigger": "axis"
     },
     "legend": {
       "data": [],
       "show": false
     },
     "grid": {
       "left": 5,
       "right": 15,
       "bottom": "2%",
       "top": "4%",
       "containLabel": true,
       "show": true,
       "backgroundColor": "transparent"
     },
     "xAxis": {
       "type": "category",
       "boundaryGap": false,
       "data": [
         "0:00",
         "0:30",
         "1:00",
         "1:30",
         "2:00",
         "2:30",
         "3:00",
         "3:30",
         "4:00",
         "4:30",
         "5:00",
         "5:30",
         "6:00",
         "6:30",
         "7:00",
         "7:30",
         "8:00",
         "8:30",
         "9:00",
         "9:30",
         "10:00",
         "10:30",
         "11:00",
         "11:30",
         "12:00",
         "12:30",
         "13:00"
       ],
       "splitLine": {
         "show": false
       },
       "axisTick": {
         "show": false
       },
       "axisLine": {
         "show": false
       },
       "axisLabel": {
         "fontSize": 10
       }
     },
     "yAxis": {
       "type": "value",
       "min": 0,
       "axisTick": {
         "show": false
       },
       "axisLabel": {
         "fontSize": 10
       },
       "axisLine": {
         "show": false
       },
       "splitLine": {
         "show": true
       },
       "interval": 69211
     },
     "series": [
       {
         "name": "1",
         "type": "line",
         "smooth": true,
         "itemStyle": {
           "normal": {
             "opacity": 0
           }
         },
         "lineStyle": {
           "normal": {
             "width": 1.5,
             "color": "#AC5AFF"
           }
         },
         "z": 0,
         "areaStyle": {
           "normal": {
             "color": new echarts.graphic.LinearGradient(
                           0, 0, 0, 1,
                           [
                               { offset: 0, color: 'rgba(172,90,255,0.2)' },
                               { offset: 1, color: 'rgba(172,90,255,0)' }
                           ]
              )
           }
         },
         "data": [
           31574,
           164657,
           276844,
           101562,
           112015,
           92247,
           76087,
           75194,
           58138,
           57983,
           70396,
           90285,
           94566,
           91314,
           114043,
           91601,
           73448,
           45801,
           76783,
           257652,
           264912,
           110699,
           144759,
           117858,
           83102,
           71152,
           62269
         ]
       }
     ],
     "animationEasing": "circularOut"
   }
   
   ```
   
   
   
   
   ### Other comments [其他信息]
   <!-- For example: Screenshot or Online demo -->
   <!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
   附上JSFiddle：
   https://jsfiddle.net/vepj821g/18/

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