ng-selected 与ng-options的使用

<form class="uk-form" ng-controller="TestCtrl">
            <select ng-model="sex">
                <option value="m" ng-selected="sex==‘m‘">Male</option>
                <option value="f" ng-selected="sex==‘f‘">Fmale</option>
            </select>
            
            <p>Selected City Code: {{ city.code }}</p>
            <select ng-model="city" ng-options="city.name for city in cities"></select>
        </form>

<select ng-model="city" ng-options="city.name for city in cities"></select>

var myApp = angular.module(‘myApp‘, []);

myApp.controller(‘TestCtrl‘,[‘$scope‘, function($scope){
        $scope.sex = ‘m‘;
        
        $scope.cities = [
            {
                name:‘青岛‘,
                code:‘qd‘
            },
            {
                name:‘北京‘,
                code:‘bj‘
            },
            {
                name:‘济南‘,
                code:‘jn‘
            }
        ];
}]);