Get one of checkbox value with multiple checkbox using jquery

Get one of checkbox value with multiple checkbox using jquery

I'm trying to get checkbox value from multiple checkbox.I have code as below:
<input class="ng-pristine ng-valid" type="checkbox" name="ch" value="a"
ng-model="todo.done">
<input class="ng-pristine ng-valid" type="checkbox" name="ch" value="b"
ng-model="todo.done">
<input class="ng-pristine ng-valid" type="checkbox" name="ch" value="c"
ng-model="todo.done">
<input class="ng-pristine ng-valid" type="checkbox" name="ch" value="d"
ng-model="todo.done">
what I want: when I check on checkbox,it will alert the value of checkbox.
I have jquery code as below:
$('input[type="checkbox"]').change(function() {
$('input[type="checkbox"]').each(function() {
if ($(this).is(':checked')) {
//the problem in here when I alert it will display many time with the
other value of checkbox
//what I need: I want to get only value of it when I check on it.
alert($(this).prop('value'));
}
});
});
Anyone please kindly help me, Thanks.