已逗号拼接字符串和以逗号分隔删除

<div class="dood-friend">
            <div class="dood-friend-type-item">
                <div class="dood-friend-warp">                    
                        <div class="dood-friend-content">
                            <div class="dood-friend-content-select">
                                <div userid="4395730591" class="select" style="background: rgb(148, 200, 64) none repeat scroll 0% 0%;">√</div>
                            </div>
                            <div class="dood-friend-content-img">                                                                    
                                        <img alt="" src="../resources/images/pic.png">                                                                                                        
                            </div>
                            <div class="dood-friend-content-name">
                                <div class="name">{"name":"豆豆服务","name_en":"LiNKDOOD Service"}</div>
                            </div>
                        </div>                    
                        <div class="dood-friend-content">
                            <div class="dood-friend-content-select">
                                <div userid="4395733403" class="select" style="background: rgb(255, 255, 255) none repeat scroll 0% 0%;">√</div>
                            </div>
                            <div class="dood-friend-content-img">                                                                                                        
                                        <img alt="" src="http://test.linkdood.cn/hd1/0/head/20160621/1145/head_YlFh_5403000000812a01.jpg">                                                                    
                            </div>
                            <div class="dood-friend-content-name">
                                <div class="name">你的终点</div>
                            </div>
                        </div>                    
                        <div class="dood-friend-content">
                            <div class="dood-friend-content-select">
                                <div userid="4395721496" class="select" style="background: rgb(255, 255, 255) none repeat scroll 0% 0%;">√</div>
                            </div>
                            <div class="dood-friend-content-img">                                                                                                        
                                        <img alt="" src="http://test.linkdood.cn/at010/0/file/20160615/1735/a_cR5z_e2e40000002a2a01.png">                                                                    
                            </div>
                            <div class="dood-friend-content-name">
                                <div class="name">工作志</div>
                            </div>
                        </div>                    
                        <div class="dood-friend-content">
                            <div class="dood-friend-content-select">
                                <div userid="4395733351" class="select" style="background: rgb(255, 255, 255) none repeat scroll 0% 0%;">√</div>
                            </div>
                            <div class="dood-friend-content-img">                                                                   
                                        <img alt="" src="../resources/images/pic.png">                                  
                                
                            </div>
                            <div class="dood-friend-content-name">
                                <div class="name">严启阳</div>
                            </div>
                        </div>
                        <div class="dood-friend-content">
                            <div class="dood-friend-content-select">
                                <div userid="4395733852" class="select" style="background: rgb(148, 200, 64) none repeat scroll 0% 0%;">√</div>
                            </div>
                            <div class="dood-friend-content-img">

                                        <img alt="" src="../resources/images/pic.png">
          
                            </div>
                            <div class="dood-friend-content-name">
                                <div class="name">陈锋</div>
                            </div>
                        </div>
                    
                        <div class="dood-friend-content">
                            <div class="dood-friend-content-select">
                                <div userid="4395733861" class="select">√</div>
                            </div>
                            <div class="dood-friend-content-img">                                                                   
                                        <img alt="" src="../resources/images/pic.png">                                                                        
                                
                            </div>
                            <div class="dood-friend-content-name">
                                <div class="name">若如初见</div>
                            </div>
                        </div>
                    
                </div>
            </div>
            <input type="hidden" id="userIDContainer" value="4395730591,4395733852">
        </div>

$(".select").toggle(function() {                var userIDContainers = $('#userIDContainer').val();
                $('#userIDContainer').val((/^s*$/.test(userIDContainers) ? '' : userIDContainers + ',') + $(this).attr("userID"));
            }, function() {                var userIDContainers = $('#userIDContainer').val();
                var pattern = new RegExp($(this).attr("userID") + "(,)?", "g");
                $('#userIDContainer').val(userIDContainers.replace(pattern, "").replace(/,?$/, ""));
            });