AngularJS Select 初始化值

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<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="https://cdn.staticfile.org/angular.js/1.6.6/angular.min.js"></script>
    </head>
    <body>
        <div ng-app="myApp" ng-controller="myCtrl">
            <select ng-init="selectPerson=persons['caohui']" ng-model="selectPerson"
            ng-options="x for (x,y) in persons">
            </select>
            <p>
                年龄:{{selectPerson.age}}
            </p>
            <p>
                性别:{{selectPerson.sex}}
            </p>
            <p>
                月薪:{{selectPerson.salary}}
            </p>
        </div>
        <script>
            var app = angular.module('myApp', []);
            app.controller('myCtrl',
            function($scope) {
                $scope.persons = {
                    caohui: {
                        age: 27,
                        sex: 'male',
                        salary: 10000
                    },
                    youlangta: {
                        age: 20,
                        sex: 'male',
                        salary: 500
                    },
                    chenyanchan: {
                        age: 24,
                        sex: 'female',
                        salary: 6000
                    }
                }
            })
        </script>
    </body>
​
</html>
HTML