Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<div ng-controller="MyCtrl">
  <div ng-show="quantity > 0">
    <button ng-click="quantity = quantity-1">-</button>
    <p>{{quantity}}</p>
  </div>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

function MyCtrl($scope) {
    $scope.quantity = 6;
}