formatMoney(val) {
     if (val === null || val === undefined || isNaN(val)) return '—';
   
     val = Number(val);
   
     if (val >= 10000) {
       return '¥' + (val / 10000).toFixed(2) + '万';
     }
   
     return '¥' + val.toFixed(2);
   }