<div class="goods_num clearfix">

                 <div class="num_name fl">数 量：</div>

                    <div class="num_add fl">

                        <input type="text" name="num" class="num_show fl" value="1">

                        <a href="javascript:;" class="add fr">+</a>

                        <a href="javascript:;" class="minus fr">-</a>

                    </div>

                </div>

<div class="total">总价：<em id="price">{{ good.price }}</em>元</div>

 <script>

        $(function () {

            //加号

            var price1 = parseFloat($('#price').text());

            var num = parseInt($('input[name="num"]').attr('value'));

            $('.add').click(function(){

                num++;

                $('input[name="num"]').attr('value',num);

                var total = num * price1;

                $('#price').html(total.toFixed(2));

            });

            //减号

            $('.minus').click(function () {

                if(num>1){

                    num--;

                    $('input[name="num"]').attr('value',num);

                    console.log(num)

                    var total = num * price1;

                    $('#price').text(total.toFixed(2));

                }

            });

        });

    </script>