打钩的元素有个on的class。

        // 礼物发送function send_gift() {var type,diamond,name,id;var list   = $('.live .on');var length = list.length;console.log(length);if(length == 0){toast('请勾选要发送的礼物');}else{// 默认获取第一个匹配的元素信息id = list.data('id');diamond = list.data('diamond');name = list.data('name');type = list.data('type');//  alert(id+"-"+diamond+"-"+name+"-"+type);}}

点击发送按钮，选中这个元素。

    <div class="gift_more" id="gift"><div class="gift_more_mask" onclick="giftmask()"></div><div class="gift_more_popup"><div id="aui-slide"><div class="aui-slide-wrap live"><div class="aui-slide-node"><div class="aui-grid"><div class="aui-row"><div class="aui-col-xs-3 gift_item on" data-id="1" data-diamond="1" data-type="little" data-name="爱心小熊"><img src="../image/live/gift/s_gift_1.png" class="gift_img"><div class="aui-grid-label">爱心小熊</div><div class="gift_more_popup_labe">1云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="2" data-diamond="2" data-type="little" data-name="棒棒糖"><img src="../image/live/gift/s_gift_2.png" class="gift_img"><div class="aui-grid-label">棒棒糖</div><div class="gift_more_popup_labe">2云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="3" data-diamond="5" data-type="little" data-name="冰淇淋"><img src="../image/live/gift/s_gift_3.png" class="gift_img"><div class="aui-grid-label">冰淇淋</div><div class="gift_more_popup_labe">5云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="4" data-diamond="52" data-type="little" data-name="钻戒"><img src="../image/live/gift/s_gift_4.png" class="gift_img"><div class="aui-grid-label">钻戒</div><div class="gift_more_popup_labe">52云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="5" data-diamond="520" data-type="big" data-name="告白气球"><img src="../image/live/gift/s_gift_5.png" class="gift_img"><div class="aui-grid-label">告白气球</div><div class="gift_more_popup_labe">520云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="6" data-diamond="666" data-type="big" data-name="金话筒"><img src="../image/live/gift/s_gift_6.png" class="gift_img"><div class="aui-grid-label">金话筒</div><div class="gift_more_popup_labe">666云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="7" data-diamond="999" data-type="big" data-name="皇冠"><img src="../image/live/gift/s_gift_7.png" class="gift_img"><div class="aui-grid-label">皇冠</div><div class="gift_more_popup_labe">999云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="8" data-diamond="1200" data-type="big" data-name="保时捷"><img src="../image/live/gift/s_gift_8.png" class="gift_img"><div class="aui-grid-label">保时捷</div><div class="gift_more_popup_labe">1200云钻</div><i class="gift_alt"></i></div></div></div></div><div class="aui-slide-node"><div class="aui-grid"><div class="aui-row"><div class="aui-col-xs-3 gift_item" data-id="9" data-diamond="888" data-type="big" data-name="心钻皇冠"><img src="../image/live/gift/s_gift_9.png" class="gift_img"><div class="aui-grid-label">心钻皇冠</div><div class="gift_more_popup_labe">888云钻</div><i class="gift_alt"></i></div><div class="aui-col-xs-3 gift_item" data-id="10" data-diamond="999" data-type="big" data-name="水晶鞋"><img src="../image/live/gift/s_gift_10.png" class="gift_img"><div class="aui-grid-label">水晶鞋</div><div class="gift_more_popup_labe">999云钻</div><i class="gift_alt"></i></div></div></div></div></div><div class="aui-slide-page-wrap"><!--分页容器--></div></div><div class="gift_more_bottom"><span class="aui-col-xs-3 gift_send2">我的账单</span><span class="aui-col-xs-3 gift_send1">余额：<span id="diamond_num"></span></span><span class="aui-col-xs-3 gift_send1" style="color:#33B140;" ><span onclick="openWinPro('living_recharge');">充值</span></span><span class="aui-col-xs-3 aui-btn-sm aui-btn-info gift_send" onclick="send_gift();">发送</span></div></div></div>