You can use ng-change instead of ng-click:
<!doctype html>
<html>
<head>
<script src="http://code.angularjs.org/1.2.3/angular.min.js"></script>
<script>
var app = angular.module('myapp', []);
app.controller('mainController', function($scope) {
$scope.vm = {};
$scope.vm.myClick = function($event) {
alert($event);
}
});
</script>
</head>
<body ng-app="myapp">
<div ng-controller="mainController">
<input type="checkbox" ng-model="vm.myChkModel" ng-change="vm.myClick(vm.myChkModel)">
</div>
</body>
</html>