jq购物车结算功能

css

    *{font-style: normal}
    .gw{margin: 8px;}
    .gw::after{display: block;clear: both;content: '';margin: 10px;}
    .gw_num{border: 1px solid #dbdbdb; 110px;line-height: 26px;overflow: hidden;float: left;}
    .gw_num em{display: block;height: 26px; 26px;float: left;color: #7A7979;border-right: 1px solid #dbdbdb;text-align: center;cursor: pointer;font-style: normal}
    .gw_num .num{display: block;float: left;text-align: center; 52px;font-style: normal;font-size: 14px;line-height: 24px;border: 0;}
    .gw_num em.add{float: right;border-right: 0;border-left: 1px solid #dbdbdb;}
    p{margin: 4px;padding: 0}
    .choose,.qx{float: left; 20px;height: 20px;border: 1px solid #ccc; border-radius: 100%;margin-right: 10px;}
    .choose-on, .qx-on{background: url(./on.png) no-repeat center center;background-size: 100%;}

    <div class="zong">
        <div class="gw">
            <div class="choose"></div>
            <div class="gw_num">
                <em class="jian">-</em>
                <input type="text" value="0" class="num"/>
                <em class="add">+</em>
            </div>
            <p>单价<i>20</i>元 总金额：￥<span>0</span></p>
            <div class="del">删除</div>
        </div>
        <div class="gw">
            <div class="choose"></div>
            <div class="gw_num">
                <em class="jian">-</em>
                <input type="text" value="0" class="num"/>
                <em class="add">+</em>
            </div>
            <p>单价<i>40</i>元 总金额：￥<span>0</span></p>
            <div class="del">删除</div>
        </div>
        <div class="gw">
            <div class="choose"></div>
            <div class="gw_num">
                <em class="jian">-</em>
                <input type="text" value="0" class="num"/>
                <em class="add">+</em>
            </div>
            <p>单价<i>40</i>元 总金额：￥<span>0</span></p>
            <div class="del">删除</div>
        </div>
        <div class="gw">
            <div class="choose"></div>
            <div class="gw_num">
                <em class="jian">-</em>
                <input type="text" value="0" class="num"/>
                <em class="add">+</em>
            </div>
            <p>单价<i>40</i>元 总金额：￥<span>0</span></p>
            <div class="del">删除</div>
        </div>
        <div>
            <div class="qx"></div>
            <span>全选</span><span class="gs"></span>
            <p class="a">金额总计：<span>0</span></p>
        </div>
    </div>

js

    $(function(){
            $('.add').click(function(){
                var n = $(this).prev().val()
                var num = parseInt(n) + 1;
                if(n ==  5){num = 5}  //设置最大数量 5
                $(this).prev().val(num);
                var money = $(this).parents('.gw').find('i').text()
                var sum = money * num
                var p = $(this).parents('.gw').find('span').text(sum)
                // console.log(p)
                
                // var Sum = $(this).parents('.zong').find('.a > span').text(sum)
                // console.log(Sum)
                jiesuan()
            })
            $('.jian').click(function(){
                var n = $(this).next().val();
                var num = parseInt(n) - 1;
                if(n ==  0){num = 0}  //设置最小数量 0
                console.log(num)
                $(this).next().val(num);
                var money = $(this).parents('.gw').find('i').text()
                var sum = money * num
                var p = $(this).parents('.gw').find('span').text(sum)
                jiesuan()
            })
            //选中
            $('.choose').click(function(){
                $(this).toggleClass('choose-on')
                // console.log('aa')
                jiesuan()
                xz()
                qx()
            })
            //全选
            $('.qx').click(function(){
                $(this).toggleClass('qx-on')
                if($(this).is('.qx-on')){
                    $('.choose').addClass('choose-on')
                }else{
                    $('.choose').removeClass('choose-on')
                }
                jiesuan()
                qx()
            })
            
            //删除
            $('.del').click(function(){
                if(confirm('确定删除商品')){
                    $(this).parents('.gw').remove()
                }
                jiesuan()
                qx()
                // console.log(a)
                
            })
        })

        function jiesuan(){
            var num = 0;
            // alert('aa')
            $('.gw').each(function(){
                if($(this).find('.choose').is('.choose-on')){
                    //获取物品单价 
                    var dj = $(this).find('i').text()
                    //获取物品数量
                    var sl = $(this).find('.num').val()
                    //合计
                    var hj = dj * sl 
                    num += hj;
                }
                
            })
            $('.a>span').text(num)
        }
        
        
        //单选--全选中
        function xz(){
            var choose = $('.choose')
            var choose_on = $('.choose-on')
            if(choose.length == choose_on.length){
                $('.qx').addClass('qx-on')
            }else{
                $('.qx').removeClass('qx-on')
            }
        }

        //全选
        function qx(){
            $('.gs').text(' ')
            var a = $('.choose-on').length;
            $('.gs').text(a)
            if(a > 0){
                $('.gs').prev().text('已选')
            }else{
                $('.gs').prev().text('全选')
            }
        }