在ng-repeat中处理两行相同颜色的n个项目

angular.module('AppModal', []).controller('OTASheetCtrl', ['$scope', function ($scope) {
  $scope.array=[1,2,3,4,5,6,7,8,9,10];
  }]);

.odd{
    background-color: grey;
}

.even{
    background-color: #d09683;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="AppModal" ng-controller="OTASheetCtrl">
<ul ng-repeat="x in array">
  <li ng-class="{'even':$index%4<=1, 'odd':$index%4<=3}">
    {{x}}
  </li>
</ul>
  </div>