angularJS文本框根据输入字符（文本框值）进行查询ng-keydown ng-keyup

<input
type="text"
ng-model="employee.account"
ng-keydown
/>

/*directives*/
angular.module('activitiModeler').directive('ngKeydown', function() {
return {
restrict: 'A',
link: function(scope, elem, attrs) {
//var functionToCall = scope.$eval(attrs.ngKeydown);
elem.on('keydown', function(e){
alert(e+','+e.which);
});
}
};
});

/*directives*/
angular.module('activitiModeler').directive('ngKeydown', function() {
return {
restrict: 'A',
link: function(scope, elem, attrs) {
//var functionToCall = scope.$eval(attrs.ngKeydown);
elem.on('keyup', function(e){
alert(scope.employee.account);
});
}
};
});