angular select 預設選中指定項，option動态渲染

<select ng-model="com.game_id" ng-options="x.game_id as x.game_name for x in game_info">
</select>
           

$scope.game_info =  [
            {game_id :  , game_name:'全部遊戲'},
            {game_id :  , game_name:'穿越火線'},
            {game_id :  , game_name:'地下城與勇士'},
            {game_id :  , game_name:'使命召喚'},
            {game_id :  , game_name:'英雄聯盟'},
            {game_id :  , game_name:'逆戰'},
            ];
$scope.com = {
    game_id://指定項，
｝
           

如圖所示：