ng-repeat的列表源调用了太多次

angular.module('NGTest', [
])
.controller('ItemList', ['$scope', function($scope) {
	console.log("ItemList controller init");
	var self = this;
  self.count = 4;
  self.getItems = function() {
  	console.log("ItemList.getItems() called");
	  return [];
  }
}]);angular.module('NGTest', [
])
.cont