问Vue模板条件渲染器

EN

<div id="app" class="container">
    <div v-for="player in players">
        <div class="row" v-if="($index + 1) % 3 == 0 ">
          {{$index + 1}}
        </div>
    </div>
</div>

<template id="players-template">
<div class="row">
    <template v-for="player in players">
        <div class="col-md-4">
            <div class="panel panel-default">
                <div class="panel-heading">
                    <h3 class="panel-title">
                        <a href="#">{{ player.username }}</a>
                        <span class="small pull-right">{{ player.createdAt }}</span>
                    </h3>
                </div>

                <div class="panel-body">
                    <img alt="" class="img-circle center-block">
                </div>
                <div class="panel-footer">
                    <div class="btn-group btn-group-justified" role="group" aria-label="...">
                        <a href="#" class="btn btn-primary btn-success send-message" data-toggle="tooltip" data-placement="bottom" title="Wyślij wiadomość" id="{{ player.username }}"><span class="glyphicon glyphicon-envelope"></span>&nbsp;</a>
                        <a href="#" class="btn btn-primary btn-info" data-toggle="tooltip" data-placement="bottom" title="Pokaż profil"><span class="glyphicon glyphicon-user"></span>&nbsp;</a>
                        <a href="#" class="btn btn-primary btn-primary" data-toggle="tooltip" data-placement="bottom" title="Zobacz szczegółowe informacje o poście"><span class="glyphicon glyphicon-option-horizontal"></span>&nbsp;</a>
                    </div>
                </div>
            </div>
        </div>

        <template v-if="($index + 1) % 3 == 0 ">
        </div><div class="row">
        </template>
    </template>
</div>
</template>