请问怎么修改才能实现这个功能需求啊 : 商城的用户下单，收货地址相同会弹出提醒，不能进行保存。

<div id="addaddress"   style="display:none">
    <div class="address-alert style1">
        <div class="address-title">请填写收货地址哦！</div>
        <?php  if(is_weixin() && $_W['shopset']['trade']['shareaddress']) { ?>
        <div class="fui-cell-group order-info noborder">
            <a class="fui-cell" id="btn-address">
                <div class="fui-cell-text">
                    <span class="icon icon-weixin1" style="margin-right: .3rem;color:#62b900;font-size:1rem"></span>从微信选择地址(如点击无反应请刷新重试)
                </div>
                <div class="fui-cell-remark text-danger">
                </div>
            </a>
        </div>
        <?php  } ?>
        <div class="fui-cell-group" style="margin-top:0">
            <div class="fui-cell">
                <div class="fui-cell-label">收货人</div>
                <div class="fui-cell-info c000">
                    <input type="text" id="realname" name="realname" value="" placeholder="请填写收货人姓名" class="fui-input"></div>
            </div>
            <div class="fui-cell">
                <div class="fui-cell-label">手机号</div>
                <div class="fui-cell-info c000">
                    <input type="tel" id="mobile" name="mobile" value="" placeholder="联系电话" class="fui-input">
                </div>
            </div>
            <div class="fui-cell">
                <div class="fui-cell-label">选择地区</div>
                <div class="fui-cell-info c000">
                    <input type="text" id='areas'  name='areas' data-value="" value="" placeholder="所在地区"  class="fui-input" readonly=""/>
                </div>
                <div class="fui-cell-remark noremark"><i class="icon icon-arrow-down" style="font-size:.8rem;color:#b2b2b2"></i> </div>
            </div>

            <?php  if(!empty($new_area) && !empty($address_street)) { ?>
            <div class='fui-cell'>
                <div class='fui-cell-label'>所在街道</div>
                <div class='fui-cell-info c000'>
                    <input type="text" id='street'  name='street' data-value="" value="" placeholder="所在街道"  class="fui-input" readonly=""/>
                </div>
            </div>
            <?php  } ?>

            <div class="fui-cell fui-cell-textarea">
                <div class="fui-cell-label " style="margin:0">
                    详细地址
                </div>
                <div class="fui-cell-info c000">
                    <!--<textarea rows="2" id='address' name='address' placeholder="请写门牌号等"></textarea>-->
                    <div class='fui-cell-info c000'><input type="text" id='address' name='address' value="" placeholder='街道，楼牌号等'  class="fui-input"/></div>
                </div>
            </div>

        </div>

        <a id="btn-submit" class=" btn btn-danger disable block">保存地址</a>
        <i class="icon icon-guanbi1" id="address-colse" style="font-size:1.5rem;color:#fff;position: absolute;top:105%;left:46%"></i>
    </div>
</div>

给submit的a标签加个JS函数去ajax提交表单去后端处理验证下，不合规则的直接retrun 回来一个error 然后alert一个窗口提醒

如果有帮助，请点个采纳哦。

先把原先的地址给记录下来，点击按钮后和原先的对比，一样则弹窗，不一样就保存。请问你是哪里不明白？