如何使用angularjs将ng-repeat $index保存到DB (行数: 1.1 ,1.2,1.3)

<div ng-repeat="item in items">
  <span>{{$index}}</span>
  <span>{{item.name}}</span>
</div>

app.controller('MyController', function($scope, $http) {
  $scope.saveIndexToDB = function(index) {
    $http.post('/api/saveIndex', {index: index})
      .then(function(response) {
        // 处理保存成功的逻辑
      })
      .catch(function(error) {
        // 处理保存失败的逻辑
      });
  };
});

<div ng-repeat="item in items">
  <span>{{$index}}</span>
  <span>{{item.name}}</span>
  <button ng-click="saveIndexToDB($index)">保存到数据库</button>
</div>