本文实例为大家分享了JavaScript实现购物车功能的具体代码，供大家参考，具体内容如下
HTML结构
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="./css/02-reset.css">
<link rel="stylesheet" href="./css/style.css">
</head>
<body>
<!-- 简单写个大盒子分大三栏 -->
<div class="cart">
<!-- 购物车头部 -->
<div class="cart-head clearfix">
<div class="col col-check u-l">
<input type="checkbox" id="all" class="check">
<label for="all">全选</label>
</div>
<div class="col col-img u-l"> </div>
<div class="col col-name u-l">商品名称</div>
<div class="col col-price u-l">单价</div>
<div class="col col-num u-l">数量</div>
<div class="col col-sum u-l">小计</div>
<div class="col col-action u-r">操作</div>
</div>
<!-- 购物车列表 -->
<div class="cart-list">
<!-- 商品块 -->
<div class="list-item">
<div class="item-box ">
<div class="col col-check u-l">
<input type="checkbox" class="check single">
</div>
<div class="col col-img u-l">
<img src="./images/1.jpg" alt="">
</div>
<div class="col col-name u-l">8848 移动版 4GB+64GB 千峰蓝</div>
<div class="col col-price u-l">8888元</div>
<div class="col col-num u-l ">
<div class="change-goods-num">
<a href="javascript:;" class="jianhao">-</a>
<input type="text" value="1">
<a href="javascript:;" class="jiahao">+</a>
</div>
</div>
<div class="col col-sum u-l">8888元</div>
<div class="col col-action u-r">删除</div>
</div>
<div class="item-box ">
<div class="col col-check u-l">
<input type="checkbox" class="check single">
</div>
<div class="col col-img u-l">
<img src="./images/1.jpg" alt="">
</div>
<div class="col col-name u-l">8848 移动版 4GB+64GB 千峰蓝</div>
<div class="col col-price u-l">8888元</div>
<div class="col col-num u-l ">
<div class="change-goods-num">
<a href="javascript:;" class="jianhao">-</a>
<input type="text " value="1">
<a href="javascript:;" class="jiahao">+</a>
</div>
</div>
<div class="col col-sum u-l">8888元</div>
<div class="col col-action u-r">删除</div>
</div>
<div class="item-box ">
<div class="col col-check u-l">
<input type="checkbox" class="check single">
</div>
<div class="col col-img u-l">
<img src="./images/1.jpg" alt="">
</div>
<div class="col col-name u-l">8848 移动版 4GB+64GB 千峰蓝</div>
<div class="col col-price u-l">8888元</div>
<div class="col col-num u-l ">
<div class="change-goods-num">
<a href="javascript:;" class="jianhao">-</a>
<input type="text" value="1">
<a href="javascript:;" class="jiahao">+</a>
</div>
</div>
<div class="col col-sum u-l">8888元</div>
<div class="col col-action u-r">删除</div>
</div>
<div class="item-box ">
<div class="col col-check u-l">
<input type="checkbox" class="check single">
</div>
<div class="col col-img u-l">
<img src="./images/1.jpg" alt="">
</div>
<div class="col col-name u-l">8848 移动版 4GB+64GB 千峰蓝</div>
<div class="col col-price u-l">8888元</div>
<div class="col col-num u-l ">
<div class="change-goods-num">
<a href="javascript:;" class="jianhao">-</a>
<input type="text" value="1">
<a href="javascript:;" class="jiahao">+</a>
</div>
</div>
<div class="col col-sum u-l">8888元</div>
<div class="col col-action u-r">删除</div>
</div>
</div>
</div>
<!-- 购物车底部 -->
<div class="cart-foot">
<div class="section-left u-l">
<a href="">继续购物</a>
<span>已选择 <i id="totalNum">0</i> 件商品</span>
</div>
<div class="u-r settlement">去结算</div>
<div class="u-r total-price">合计： <em id="totalPrice">0</em>元</div>
</div>
</div>
<script type="text/javascript" src="./js/script.js"></script>
</body>
</html>css结构
*{
margin: 0;padding: 0
}
b,strong{
font-weight: normal
}
i,em{
font-style: normal
}
a,u{
text-decoration: none
}
a{
color: #000;
}
ul,ol,li{
list-style: none
}
.u-l{
float: left;
}
.u-r{
float: right;
}
.clearfix{
clear: both;
}.cart{
margin:0 auto;
width: 1200px;
}
.cart-head{
height: 70px;
line-height: 70px;
}
.col{
width: 120px;
}
.col-img img{
width: 100px;
height: 100px;
}
.col-name{
width: 380px;
}
.col-price{
width: 160px;
padding-right: 18px;
}
.col-num{
width: 150px;
text-align: center;
}
.col-sum{
text-align: center;
color: #ff6700;
}
.col-active{
text-align: center;
}
.item-box{
overflow: hidden;
padding: 20px 0;
border-top: 1px solid #ccc;
}
.change-goods-num{
width: 148px;
height: 38px;
border: 1px solid #000;
}
.change-goods-num a{
float: left;
width: 38px;
height: 38px;
line-height: 38px;
font-size: 20px;
color: #000;
text-align: center;
}
.change-goods-num input{
float: left;
width: 72px;
height: 38px;
font-size: 18px;
line-height: 38px;
text-align: center;
border-width: 0;
}
.cart-foot{
height: 50px;
line-height: 50px;
border: 1px solid #ccc;
}
.section-left a{
margin-left: 32px;
color: #757575;
}
.section-left span{
margin-left: 16px;
padding-left: 16px;
color: #757575;
border-left: 1px solid #ccc;
}
.section-left i{
color: #ff6700;
}
.settlement{
margin-left: 40px;
padding:0 40px ;
font-size: 18px;
background-color: orange;
color: #fff;
}
.total-price{
color: #ff6700;
}
.total-price em{
font-size: 30px;
}js结构
//获取到页面中所有复选框check
var check = document.querySelectorAll('.check');
console.log(check.length);
//获取到商品栏复选框
var single = document.querySelectorAll('.single');
console.log(single.length);
//获取每一行商品栏
var itemBox = document.querySelectorAll('.item-box');
console.log(itemBox);
for(var i=0;i<check.length;i++){
//给所有复选框添加事件
check[i].onclick = function(e){
//判断是否全选
var count = 0;
//判断全选框
if(e.target.getAttribute('id') == 'all'){
//把全选状态赋值给每一个checkbox
for(j=0;j<single.length;j++){
single[j].checked = this.checked
}
}
for(var k = 0; k<single.length;k++){
if(single[k].checked){
count++;
}
if( count == single.length){
check[0].checked = true;
}else{
check[0].checked = false;
}
}
fTotal();
}
}
//给商品每一行添加事件
for(var i = 0;i<itemBox.length;i++){
itemBox[i].onclick = function(e){
var input = this.getElementsByTagName('input')[1];
switch(e.target.className){
case 'jiahao':
// alert('加');
input.value = parseInt(input.value)+1;
fTotalSum(this);
break;
case 'jianhao':
// alert('减');
input.value = parseInt(input.value)-1 <=1 ? 1:parseInt(input.value)-1;
fTotalSum(this);
break;
case 'col col-action u-r':
var con = confirm('确定删除吗？');
if( con ){
this.parentNode.removeChild(this);
}
break;
}
//调用 计算总数量和总价
fTotal()
}
}
// 定义一个函数计算 小计 That === this 就是商品每一行
function fTotalSum(That){
//获取当前行的数量
var num = That.getElementsByTagName('input')[1].value;
//获取当前行的单价 取整是为了省略掉'元'字符串，方便计算
var price = parseInt(That.querySelector('.col-price').innerHTML);
// 最终小计值为数量乘以单价
That.querySelector('.col-sum').innerHTML = num * price+'元';
};
//定义一个函数 方便调用总数量 和 合计
function fTotal(){
//获取到总价节点
var totalPrice = document.getElementById('totalPrice');
//总价
var price = 0;
//获取到总件节点
var totalNum = document.getElementById('totalNum');
//数量总和
var Num = 0;
//获取每一行商品盒子
var itemBox = document.querySelectorAll('.item-box');
for(var i = 0; i<itemBox.length;i++){
itemBox[i].getElementsByTagName('input')[1].value;
//选中了，才拿数量和价格
if( itemBox[i].getElementsByTagName('input')[0].checked ){
Num += parseInt(itemBox[i].getElementsByTagName('input')[1].value);
price += parseInt(itemBox[i].querySelector('.col-sum').innerHTML);
}
}
//合并把总和数量写到标签里
totalNum.innerHTML = Num;
totalPrice.innerHTML = price;
}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
