javascript - Angular 1.x: How to execute various action when checkbox is checked and unchecked -

i have html input checkbox field this:

<input type="checkbox"  ng-change="itemchecked()"> happy 

my amgular 1.x code this:

$scope.itemchecked = function(){       // if checked     // eg: have google map , when function called,      //     loads marker , adds businesses name.               // return original state when unchecked      // eg: when checked, loads business in google map,      //     when unchecked, supposed remove marker      //     points google maps, if page loaded  }; 

i able to:

// if checked

but not able revert original state.

how do that?

fyi: there going multiple checkbox, refreshing page wont work.

add ng-model input , check value in on change function

<input type="checkbox" ng-model="checked"  ng-change="itemchecked()">  $scope.itemchecked = function(){        if($scope.checked == true){         // if checked      }      else{        // return original state      }  };