Js点餐加减数量

时间：2022-10-17 18:36:46
       <button class="add-on" onclick="chgNum(1,'del')" ><i class="icon-minus"></i></button>

       <input class="span3 text-center" id="appendedPrependedInput1" disabled="disabled" type="text" value="">

       <button class="add-on" onclick="chgNum(1,'add')"><i class="icon-plus"></i></button>
<script>

        function chgNum(ndid, opr){                       /** 点餐加减数量，参照以前的**/

            var index= parseInt($('#appendedPrependedInput'+ndid).val());

            var price = $('.price').html().substring();

            if(opr=='del'){

                if(index == ){

                    alert("不能减了！");

                    return ;

                }

                $("#appendedPrependedInput"+ndid).val(index - );

                index = index - ;

            }else if(opr=='add'){

                if(index == ){

                    alert('不能加了！');

                    return ;

                }

                $("#appendedPrependedInput"+ndid).val(index + );

                index = index + ;

            }

            $('.nums').html(index);

            $('.total').html(index*price+'元')

        }

    </script>

第二种方法：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title></title>

<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.1.min.js"></script>

<script> 

$(function(){

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

        var t=$(this).parent().find('input[class*=text_box]');

        t.val(parseInt(t.val())+)

        setTotal();

    }) 

    $(".min").click(function(){

        var t = $(this).parent().find('input[class*=text_box]');

            t.val(parseInt(t.val())-)

            if(parseInt(t.val())<){

                t.val();

            }

        setTotal();

    }) 

    function setTotal(){

        var s=;

        $("#tab td").each(function(){

            s +=parseInt($(this).find('input[class*=text_box]').val())*parseFloat($(this).find('span[class*=price]').text());

        });

        $("#total").html(s.toFixed());

    } 

    setTotal(); 

}) 

</script>

</head>

<body>

<table id="tab">

    <tr>

        <td>

            <span>单价:</span><span class="price">1.50</span>

            <input class="min" name="" type="button" value="-" />

            <input class="text_box" name="" type="text" value="" />

            <input class="add" name="" type="button" value="+" />

        </td>

    </tr>

    <tr>

        <td>

            <span>单价:</span><span class="price">3.95</span>

            <input class="min" name="" type="button" value="-" />

            <input class="text_box" name="" type="text" value="" />

            <input class="add" name="" type="button" value="+" />

        </td>

    </tr>

</table> 

<p>总价：<label id="total"></label></p> 

</body>

</html>

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