这篇文章主要介绍了JavaScript如何实现购物车怎么，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
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checkvar 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;}感谢你能够认真阅读完这篇文章，希望小编分享的“JavaScript如何实现购物车怎么”这篇文章对大家有帮助，同时也希望大家多多支持编程网，关注编程网行业资讯频道，更多相关知识等着你来学习!
