带角滤波器的条件货币符号

$scope.countries = [{name: 'UNITED KINGDOM', id: 1, sign:"£", 'val':2300987 },{name:    'AUSTRIA', id: 2, sign:"€", 'val':6703482 }
// In HTML
   <tr ng-repeat="country in countries">
        <td class="td-border">{{country.val| currency}}</td>
   </tr>
$scope.countries = [{name: 'UNITED KINGDOM', id