问在AngularJS中如何触发指令测试中的ng更改？

...
template: "<input ng-model='myModel' ng-change='doIt()' type='text'>" 

el.find('input').trigger('change') // Dos not trigger ng-change

template: "<input ng-model='myModel' type='text'>",
link: function(scope, element, attrs) {
  element.bind('change', function(event) {
    scope.doIt();
  });
}