Style fix

src/pages/mine/index.tsx

@@ -7,6 +7,7 @@ import React, { useEffect, useState } from 'react';
 import { connect, DispatchProp } from 'dva';
 import { Spin, Input, Select, message } from 'antd';
 import { formatMessage } from 'umi-plugin-locale';
+import _ from 'lodash';
 import { QRCanvas } from 'qrcanvas-react';
 import Clipboard from 'react-clipboard.js';
 import { MineModelState } from './model';
@@ -56,7 +57,7 @@ const MinePage: React.FC<DispatchProp & MineModelState> = ({
                 <Option
                   key={it.id}
                   value={it.id}
-                >{it.label.toUpperCase()}</Option>
+                >{(_.take(it.label, 4).join('')).toUpperCase()}</Option>
               ))}
             </Select>
           </div>