$scope.years = [2014, 2015, 2016];

 <select ng-model="item" ng-options="item as y for y in years"> </select>

$scope.item = 2016;$scope.years = [2014, 2015, 2016];

$scope.sites = [ {site : "baidu", url : "https://www.baidu.com"}, {site : "163", url : "http://www.163.com"}, {site : "sina", url : "http://www.sina.com"}];

 <select ng-model="s.site" ng-options="s.site as s.site group by site.group for s in sites"> </select>

$scope.site = "163";$scope.sites = [ {site : "baidu", url : "https://www.baidu.com"}, {site : "163", url : "http://www.163.com"}, {site : "sina", url : "http://www.sina.com"}];

$scope.cars = {car1 : {brand : "BYD", model : "Y50", color : "red"},car2 : {brand : "CC", model : "HF", color : "white"},car3 : {brand : "JL", model : "JL10D", color : "black"}};

<select ng-model="myCar" ng-options="y.brand for (x, y) in cars"></select>

$scope.site = "BYD";$scope.cars = {car1 : {brand : "BYD", model : "Y50", color : "red"},car2 : {brand : "CC", model : "HF", color : "white"},car3 : {brand : "JL", model : "JL10D", color : "black"}};

label for value in arrayselect as label for value in arraylabel group by group for value in arrayselect as label group by group for value in array track by trackexpr

label for (key , value) in objectselect as label for (key , value) in objectlabel group by group for (key, value) in objectselect as label group by group for (key, value) in ob