[GitHub] [echarts] plainheart edited a comment on issue #15858: how to change the Y axisLabel to base-10 exponential form ?

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

plainheart edited a comment on issue #15858:
URL: https://github.com/apache/echarts/issues/15858#issuecomment-940589952


   参见以下两种方式
   
   ```js
   // 使用预设字符
   const superscripts = ['⁰', '¹', '²', '³', '⁴', '⁵', '⁶', '⁷', '⁸', '⁹'];
   function getSuperScripts(val) {
     return (val + '')
       .split('')
       .map(t => superscripts[t])
       .join('');
   }
   
   // 使用 Unicode
   const superscriptsUnicode = ['B9', 'B2', 'B3'];
   function getSuperScripts2(val) {
     return (val + '')
       .split('')
       .map(t => String.fromCharCode('0x' + (t > 0 && t < 4 ? '00' + superscriptsUnicode[t - 1] : '207' + t)))
       .join('');
   }
   ```
   
   然后 ECharts 添加 `axisLabel` 配置
   
   ```js
   axisLabel: {
       formatter: (val) => {
         // 2 为底数 val 为指数
        // getSuperScripts 或 getSuperScripts2 均可
         return '2' + getSuperScripts2(val);
       }
   }
   ```


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