ng-change does not trigger when the checkbox is already checked

Here is the background:the checkbox was checked when "isChecked == 1" while its initalization,however,it doesn't trigger the "ng-change" event in its first "click" action.

<td ng-repeat="isCheck in item.check track by $index">
    <input type="checkbox" ng-model="isCheck" ng-checked="isCheck == 1" ng-true-value="1" ng-false-value="0" ng-change="f(isCheck, item, vm.modules[$index])"/>
</td>