jqure全选/取消

平时我们会遇到全选/全取消，

前台效果：

<div class="fix pb40 mt32 ml30 lh22">
                <div class="l mr20">
                    <input type="checkbox" class="va-2" id="selectall">
                    <span class="red">全部</span>
                </div>
                <div class="cell g3">

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">北京</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">上海</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">天津</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">重庆</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">河北</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">山西</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">辽宁</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">吉林</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">江苏</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">浙江</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">安徽</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">福建</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">江西</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">山东</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">河南</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">湖北</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">湖南</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">广东</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">广西</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">海南</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">四川</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">贵州</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">云南</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">西藏</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">陕西</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">甘肃</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">青海</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">宁夏</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">新疆</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">内蒙古</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">黑龙江</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">台湾</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">香港</span>

                    <input type="checkbox" class="msglists" name="address">
                    <span class="w74 dib">澳门</span>

                </div>
            </div>

代码如下；

$(function () {
    $("#selectall").change(function () {
        
        var ischecked = $(this).prop("checked");
        
        $(".msglists").each(function () {
            $(".msglists").prop("checked", ischecked)
            $("#selectall").prop("checked", ischecked);
            });
            renewtotalpriceandcount();
    });
});//美术按地区查询高校库反选