如何在Angularjs中显示密码不匹配的错误信息？

<div ng-show="passwordsMismatch">密码不匹配，请重新输入。</div>

$scope.passwordsMismatch = false;

$scope.$watchGroup(['password', 'confirmPassword'], function(newValues) {
  var password = newValues[0];
  var confirmPassword = newValues[1];
  
  if (password !== confirmPassword) {
    $scope.passwordsMismatch = true;
  } else {
    $scope.passwordsMismatch = false;
  }
});

div[ng-show="passwordsMismatch"] {
  color: red;
}