今天简单写了一个jq版购物车计算金额总和的例子，如图：
整体页面代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="{CHARSET}">
<title></title>
<script type="text/javascript" src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<style>
*{
list-style: none;
}
html,body{
margin: 0;
padding: 0;
}
.all-list{
padding: 40px;
margin: 0 auto;
}
.choose-list{
overflow: hidden;
}
.choose-list >h5{
display: block;
font-size: 14px;
color: #666666;
padding: 13px 0;
font-weight: normal;
}
.choose-container{
overflow: hidden;
border: 1px solid #DDDDDD;
box-sizing: border-box;
}
.choose-header{
overflow: hidden;
background-color: #F9FAFB;
padding: 0 48px;
}
.choose-header ul{
overflow: hidden;
}
.choose-header ul li{
float: left;
width: 20%;
text-align: center;
padding: 15px 0;
font-size: 12px;
color: #666666;
}
.choose-content{
padding: 0 48px;
overflow: hidden;
}
.choose-content ul{
overflow: hidden;
}
.choose-content ul li{
float: left;
width: 20%;
text-align: center;
padding: 15px 0;
line-height: 28px;
color: #555555;
}
.add-number{
overflow: hidden;
display: inline-block;
}
.choose-content ul li .number-input{
float: left;
width: 70px;
height: 28px;
border-top: 1px;
border-bottom: 1px;
border-color: #CCCCCC;
border-style: solid none;
box-sizing: border-box;
line-height: 28px;
outline: none;
text-align: center;
color: #FE5200;
}
.choose-content ul li .minus,.choose-content ul li .add{
float: left;
width: 28px;
height: 28px;
background-color: #F9FAFB;
font-size: 14px;
outline: none;
border: 1px solid #CCCCCC;
box-sizing: border-box;
}
.choose-content ul li >span{
color: #FE5200;
}
.choose-footer{
display: flex;
justify-content: space-between;
padding: 28px 48px;
background-color: #F9FAFB;
}
.choose-footer .require{
color: #FE5200;
font-size: 14px;
align-self: center;
}
.total-price{
overflow: hidden;
}
.total-price >span{
display: block;
font-size: 14px;
color: #555555;
padding: 6px 0;
}
.total-price >span em{
font-style: initial;
text-decoration:line-through;
}
.total-price >span i{
font-style: initial;
}
.prices{
color: #EA4335 !important;
}
.pay-button{
padding: 50px 0;
float: right;
}
.pay-num{
overflow: hidden;
display: flex;
flex-direction: column;
}
.pay-num span{
float: right;
width: 100%;
font-size: 14px;
color: #666666;
text-align: center;
padding-bottom: 20px;
}
.pay-num span small{
font-size: 18px;
color: #EA4335;
}
.pay-num button{
float: right;
padding: 15px 72px;
background-color: #bebebe;
border: none;
outline: none;
font-size: 14px;
color: #ffffff;
border-radius: 3px;
cursor: not-allowed;
}
.pay-num button.state-buys{
background-color: #EA4335;
cursor: default;
}
</style>
</head>
<body>
<div class="all-list">
<div class="choose-list">
<h5>确认订单消息:</h5>
<div class="choose-container">
<div class="choose-header">
<ul>
<li>会员卡</li>
<li>原价</li>
<li>现价</li>
<li>数量</li>
<li>小计</li>
</ul>
</div>
<div class="choose-content">
<ul>
<li><span>180</span>天会员卡</li>
<li class="old-price" data-price="128">¥128</li>
<li class="now-price" data-price="99" data-val="1">¥99</li>
<li>
<div class="add-number">
<button class="minus">-</button>
<input class="number-input" value="0" onkeyup="value=value.replace(/[^\d]/g,'')" data-value="0" />
<button class="add">+</button>
</div>
</li>
<li><span class="now-total-price">¥99</span></li>
</ul>
<ul>
<li><span>365</span>天会员卡</li>
<li class="old-price" data-price="228">¥228</li>
<li class="now-price" data-price="199" data-val="2">¥199</li>
<li>
<div class="add-number">
<button class="minus">-</button>
<input class="number-input" value="0" onkeyup="value=value.replace(/[^\d]/g,'')" data-value="0" />
<button class="add">+</button>
</div>
</li>
<li><span class="now-total-price">¥199</span></li>
</ul>
<ul>
<li><span>730</span>天会员卡</li>
<li class="old-price" data-price="428">¥428</li>
<li class="now-price" data-price="329" data-val="3">¥329</li>
<li>
<div class="add-number">
<button class="minus">-</button>
<input class="number-input" value="0" onkeyup="value=value.replace(/[^\d]/g,'')" data-value="0" />
<button class="add">+</button>
</div>
</li>
<li><span class="now-total-price">¥329</span></li>
</ul>
<ul>
<li><span>终身</span>天会员卡</li>
<li class="old-price" data-price="888">¥888</li>
<li class="now-price" data-price="666" data-val="4">¥666</li>
<li>
<div class="add-number">
<button class="minus">-</button>
<input class="number-input" value="0" onkeyup="value=value.replace(/[^\d]/g,'')" data-value="0" />
<button class="add">+</button>
</div>
</li>
<li><span class="now-total-price">¥666</span></li>
</ul>
</div>
<div class="choose-footer">
<div class="require">购买要求：单笔交易需要超过300元</div>
<div class="total-price">
<span>应支付：<em>128</em></span>
<span class="prices">折后支付：<i>99</i></span>
</div>
</div>
</div>
</div>
<div class="pay-button">
<div class="pay-num">
<span>应付金额：<small>¥49元</small></span>
<button type="button">立即开通</button>
</div>
</div>
</div>
<script>
$(function(){
addMoney();
//增加按钮事件
$(document).on('click','.add-number .add',function(){
var _input = $(this).siblings('.number-input');
$(this).siblings('.number-input').val(parseInt(_input.val()) + 1);
addMoney();
});
//减少按钮事件
$(document).on('click','.add-number .minus',function(){
var _input = $(this).siblings('.number-input');
var _val = parseInt(_input.val()) - 1;
if(_val <0){
$(this).siblings('.number-input').val('0');
}else{
$(this).siblings('.number-input').val(_val);
}
addMoney();
});
//input 输入事件
$('.number-input').keyup(function(){
addMoney();
});
//input失焦事件
$('.number-input').blur(function(){
var this_val = $(this).val();
if(this_val == '' || this_val == 'undefind'){
$(this).val('0');
}else{
$(this).val(this_val);
}
});
//金额计算
function addMoney(){
var now_total = 0,
old_total= 0;
$('.choose-content ul').each(function(index){
var oldPrice = $(this).find('.old-price').attr('data-price');
var nowPrice = $(this).find('.now-price').attr('data-price');
var numbers = $(this).find('.number-input').val();
var old_price_total = oldPrice * numbers;
var now_price_total = nowPrice * numbers;
// console.log(old_price_total,now_price_total);
if(now_price_total == 0){
$(this).find('.now-total-price').html(now_price_total);
}else{
$(this).find('.now-total-price').html('¥' + now_price_total);
}
now_total += now_price_total;
old_total += old_price_total;
$('.total-price span em').html(old_total);
$('.total-price span i').html(now_total);
$('.pay-num span small').html('¥' + now_total + '元');
if(now_total >= 300){
$('.pay-num button').addClass('state-buys');
}else{
$('.pay-num button').removeClass('state-buys');
}
})
}
})
</script>
</body>
</html>