jquery: siblings使用删除当前样式，添加所有siblings样式

html:

<div class="hot-purchase">
                    <div class="title">热门团购</div>
                    <dl class="item on">
                        <dt>
                            <a href="" class="text-area">[text]</a>
                            <a href="" class="text-name">title</a>
                            <span class="price">13000</span>
                        </dt>
                        <dd class="tag-1">
                            <span class="tag">title</span>
                            <span class="description">test</span>
                        </dd>
                        <dd class="tag-2 clearfix">
                            <div class="picture-left fl">
                                <a href=""><img src="../images/consult_hot_purchase.jpg" alt=""></a>
                            </div>
                            <div class="content-right fl">
                                <p>description</p>
                                <a href="">link</a>
                            </div>
                        </dd>
                    </dl>
                    <dl class="item">
                        <dt>
                            <a href="" class="text-area">[text]</a>
                            <a href="" class="text-name">title</a>
                            <span class="price">13000</span>
                        </dt>
                        <dd class="tag-1">
                            <span class="tag">title</span>
                            <span class="description">test</span>
                        </dd>
                        <dd class="tag-2 clearfix">
                            <div class="picture-left fl">
                                <a href=""><img src="../images/consult_hot_purchase.jpg" alt=""></a>
                            </div>
                            <div class="content-right fl">
                                <p>description</p>
                                <a href="">link</a>
                            </div>
                        </dd>
                    </dl>
                    <dl class="item">
                        <dt>
                            <a href="" class="text-area">[text]</a>
                            <a href="" class="text-name">title</a>
                            <span class="price">13000</span>
                        </dt>
                        <dd class="tag-1">
                            <span class="tag">title</span>
                            <span class="description">test</span>
                        </dd>
                        <dd class="tag-2 clearfix">
                            <div class="picture-left fl">
                                <a href=""><img src="../images/consult_hot_purchase.jpg" alt=""></a>
                            </div>
                            <div class="content-right fl">
                                <p>description</p>
                                <a href="">link</a>
                            </div>
                        </dd>
                    </dl>
                    <dl class="item">
                        <dt>
                            <a href="" class="text-area">[text]</a>
                            <a href="" class="text-name">title</a>
                            <span class="price">13000</span>
                        </dt>
                        <dd class="tag-1">
                            <span class="tag">title</span>
                            <span class="description">test</span>
                        </dd>
                        <dd class="tag-2 clearfix">
                            <div class="picture-left fl">
                                <a href=""><img src="../images/consult_hot_purchase.jpg" alt=""></a>
                            </div>
                            <div class="content-right fl">
                                <p>description</p>
                                <a href="">link</a>
                            </div>
                        </dd>
                    </dl>
                    <dl class="item">
                        <dt>
                            <a href="" class="text-area">[text]</a>
                            <a href="" class="text-name">title</a>
                            <span class="price">13000</span>
                        </dt>
                        <dd class="tag-1">
                            <span class="tag">title</span>
                            <span class="description">test</span>
                        </dd>
                        <dd class="tag-2 clearfix">
                            <div class="picture-left fl">
                                <a href=""><img src="../images/consult_hot_purchase.jpg" alt=""></a>
                            </div>
                            <div class="content-right fl">
                                <p>description</p>
                                <a href="">link</a>
                            </div>
                        </dd>
                    </dl>
                </div>

js: 

$(document).ready(function () {
        $('.consult-right .hot-purchase .item').each(function (index) {
            $(this).hover(function () {
                $(this).addClass('on');
                let siblings = $(this).siblings('.item');
                siblings.removeClass('on')
            })
        })
    })