在md-directive中访问数字键

angular.module('myApp', [])
  .directive('myDirective', function() {
    return {
      link: function(scope, element, attrs) {
        element.on('keydown', function(event) {
          var keyCode = event.keyCode;
          if (keyCode >= 48 && keyCode <= 57) {
            // 处理数字键的逻辑
            console.log('按下了数字键：' + String.fromCharCode(keyCode));
          }
        });
      }
    };
  });

<div my-directive></div>