Javascript 自动滚动底部不工作。。？

当您访问对话详细信息屏幕时，屏幕应滚动至底部。应显示最新消息。卷轴底部不工作

下面是代码-autoscroll无法正常工作

<script type="text/javascript">
            $(document).ready(function(){
                $('.conversation-wrapper').animate({
                    scrollTop: $('.conversation-wrapper')[0].scrollHeight},1218.15);
            });
            </script>
            <div ng-controller="ConversationController as value">
            <br>
            <br>
            <br>
                <div class="col-lg-12">
                    <div class="main-box clearfix">
                        <header class="main-box-header clearfix">
                            <h2>Conversation</h2>
                        </header>
                        <div class="main-box-body clearfix">
                            <div class="conversation-wrapper">
                                <div class="conversation-content">
                                    <span ng-repeat="message in value">
                                        <div class="conversation-item item-left clearfix"
                                            ng-show="{{message.whoSendTheMessage.userId!=loggedUser}}">
                                            <div class="conversation-user">
                                                <img src="lib/app/img/user.jpg" style="width: 50px;" alt="">
                                            </div>
                                            <div class="conversation-body">
                                                <div class="name">{{message.whoSendTheMessage.firstName}}&nbsp;{{message.whoSendTheMessage.lastName}}</div>
                                                <div class="time hidden-xs">{{message.sendDate |
                                                    date:'yyyy-MM-dd HH:mm:ss '}}</div>
                                                <div class="text">{{message.content}}</div>
                                            </div>
                                        </div>
                                        <div class="conversation-item item-right clearfix"
                                            ng-show="{{message.whoSendTheMessage.userId==loggedUser}}">
                                            <div class="conversation-user">
                                                <img src="lib/app/img/user.jpg" style="width: 50px;" alt="">
                                            </div>
                                            <div class="conversation-body">
                                                <div class="name">{{message.whoSendTheMessage.firstName}}&nbsp;{{message.whoSendTheMessage.lastName}}</div>
                                                <div class="time hidden-xs">{{message.sendDate |
                                                    date:'yyyy-MM-dd HH:mm:ss '}}</div>
                                                <div class="text">{{message.content}}</div>
                                            </div>
                                        </div>
                                    </span>
                                    <div class="conversation-new-message message-box">
                                        <form>
                                            <div class="form-group row">
                                                <textarea class="form-control pull-left" rows="2" name="messagebox"
                                                    ng-model="message.content" placeholder="Enter your message..."></textarea>
                                                <button type="submit" ng-click="saveMessage();"
                                                    class="btn btn-success  fa fa-paper-plane message-button"></button>
                                            </div>
                                            <div class="clearfix"></div>
                                        </form>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

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嗨，欢迎吉莎。通过编辑问题，使用文本编辑器格式化代码。选择“代码”或“代码片段”按钮。嗨，Clarus Dignus，你能简单解释一下吗。。。