[GitHub] [incubator-echarts] realeve opened a new issue #13905: tooltip自定义背景色后，文字颜色无法修改

[GitBox]

realeve opened a new issue #13905:
URL: https://github.com/apache/incubator-echarts/issues/13905


   ### Version
   5.0.0
   
   ### Steps to reproduce
   tooltip自定义文字颜色无法生效
   
   ### What is expected?
   测试
   
![image](https://user-images.githubusercontent.com/448208/103334452-46f19580-4aac-11eb-90b0-fd676b619ea6.png)
   
   ```js
   option = {
       xAxis: { 
           data: ['Mon', 'Tue']
       },
       yAxis: {
           type: 'value'
       },
       backgroundColor:'#333',
       darkMode:true,
         tooltip: {
           backgroundColor: 'rgba(48, 54, 64, 0.8)', 
           extraCssText:
             'color:#fff;border-radius: 3px;border:none;',
           textStyle: {
             color: '#fff',
             fontSize: 12, 
           }, 
         },
       series: [{
           data: [150, 230],
           type: 'bar'
       }]
   };
   ```
   ### What is actually happening?
   在tooltip生成的dom结点，文字颜色被固定为了：#6E7079 ,
   
   
   
对应源码中的：https://github.com/apache/incubator-echarts/blob/master/src/component/tooltip/tooltipMarkup.ts#L406
    
   
   ```js
   const TOOLTIP_NAME_TEXT_STYLE_CSS = 'font-size:12px;color:#6e7079';
   ```
   导致用户在extraCSStext或者 textStyle中定义的内容无法生效；
   
   ### 建议
   能否给tooltip加一个css，如 .echarts-tooltip，这样方便在css层自定义样式；
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   <!-- This issue is in English. DO NOT REMOVE -->


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