JSFiddle - React, Tailwind, and code Playground
HTML
<div ng-app ng-controller="myCtrl">
<input type="checkbox" ng-model="checkval" ng-change="changed()">
{{valChanged}}
</div>
JavaScript
function myCtrl($scope){
$scope.valChanged = "unchanged";
$scope.changed = function(){
if($scope.checkval)
$scope.valChanged = "unchecked";
else $scope.valChanged = "checked";
}
}