AngularJS中使用ng-repeat的index问题

// 定义module和controller
var site = angular.module('application.site', []);
site.controller('MainController', ['$scope', '$http', function ($scope, $http) {
    $scope.users = [
        {name:"xialei",posts:["post一","post二","post三"]},
        {name:"zhangsan",posts:["post四","post五"]}
    ];
}]);

<div ng-controller="MainController">
    <dl ng-repeat="user in users">
       <dt ng-init="p_index=$index">Name:{{ user.name }}</dt>

    </dl>
</div>

<tr data-ng-repeat="(timeIndex, time) in times">
                <td style="text-align: center; width: 12.5%;" data-ng-style="doGetTimeColumnStyle($index)">{{time}}</td>
                <td   data-ng-repeat="(dayIndex, day) in days" 
                     data-ng-click="selectDatetimeSlot(dayIndex, day, timeIndex, time)">
                    <button class="popupWindow" 
                        data-ng-if="datetimeSlots[dayIndex][timeIndex].status && datetimeSlots[dayIndex][timeIndex].status != 'AVAILABLE' && datetimeSlots[dayIndex][timeIndex].status != 'EXPIRED' &&
                            datetimeSlots[dayIndex][timeIndex].mode != 'ONE_V_MANY'" 
                        data-ng-class="datetimeSlots[dayIndex][timeIndex].displayStatus | lowercase" 
                        data-placement="{{doGetTimeColumnPopOverPlacement(dayIndex, timeIndex)}}" data-animation="am-flip-x" 
                        data-trigger="focus" data-bs-popover
                        data-template="partials/timeSlotPopover.html">
                        {{datetimeSlots[dayIndex][timeIndex].displayStatus}} {{datetimeSlots[dayIndex][timeIndex].stdName}}
                    </button>

 <div ng-controller="MainController">
    <dl ng-repeat="user in users">
       <dt ng-init="p_index=$index">Name:{{ user.name }}</dt>
        <dd ng-repeat="p in user.posts">Parent index:{{ p_index }} - {{ p }}
       self Index:{{ $index }}
        </dd>
    </dl>
</div>