cookie实现购物车添加 

 
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>购物页面</title>
<style>
img{
width:300px;
height:300px;
}
ul{
list-style:none;
padding:0;
margin:0;
}
button{
width:200px;
height:50px;
text-align: center;
color:white;
background:black;
font-size: 30px;
cursor: pointer;
}
a{
display: block;
margin:0 auto;
width:200px;
height:80px;
text-align: center;
line-height :80px;
color:white;
background:red;
font-size: 60px;
font-weight: 900;
text-decoration: none;
cursor: pointer;
}
.goods li{
display:inline-block;
border:1px solid #ddd;
padding:10px;
margin:10px;
text-align: center;
}
.goods li:hover{
background-color:#efefef;
}
.goods .price{
color:#f00;
font-weight:900;
}
.goods .price::before{
content:"￥";
}
</style>
<script src = "../cookie.js"></script>
<script>
window.onload = function(){
var goods = document.getElementsByClassName('goods')[0];
// 用于保存购物车商品信息
var carList = [];
// 先获取当前cookie
var cookies = document.cookie.split('; ');
for(var i=0;i<cookies.length;i++){
var arr = cookies[i].split('=');
if(arr[0] === 'carlist'){
carList = JSON.parse(arr[1]);
}
}
// getcookie(carList);
// 事件委托
goods.onclick = function(e){
e = e || window.event;
var target = e.target || e.srcElement;
// 添加到购物车
if(target.tagName === 'BUTTON'){
// 获取当前li
var currentLi = target.parentElement.parentElement;
var children = currentLi.children;
var currentGUID = currentLi.getAttribute('data-guid');
// 先创建一个对象保存当前商品信息
var goodsObj = {};
goodsObj.guid = currentGUID;
goodsObj.qty = 1;
goodsObj.name = children[1].innerHTML;
goodsObj.price = children[2].innerHTML;
goodsObj.imgUrl = children[0].src;
// 如果cookie为空，则直接添加
if(carList.length===0){
// 添加到carList
carList.push(goodsObj);
}else{
// 先判断cookie中有无相同的guid商品
for(var i=0;i<carList.length;i++){
// 如果商品已经存在cookie中，则数量+1
if(carList[i].guid === currentGUID){
carList[i].qty++;
break;
}
}
// 如果原cookie中没有当前商品
if(i===carList.length){
// 添加到carList
carList.push(goodsObj);
}
 

}   
// 存入cookie
// 把对象/数组转换诚json字符串：JSON.stringify()
document.cookie = 'carlist=' + JSON.stringify(carList);
}
}
}
</script>
</head>
<body>
<ul class="goods">
<li data-guid="g01">
<img src="images/2.png">
<p>短袖衬衣</p>
<p class="price">98.88</p>
<div class="add2cart">
<button>添加到购物车</button>
</div>
</li>
<li data-guid="g02">
<img src="images/3.png">
<p>短袖衬衣2</p>
<p class="price">88.88</p>
<div class="add2cart">
<button>添加到购物车</button>
</div>
</li>
<li data-guid="g03">
<img src="images/4.png">
<p>短袖衬衣3</p>
<p class="price">9.98</p>
<div class="add2cart">
<button>添加到购物车</button>
</div>
</li>
<li data-guid="g04">
<img src="images/5.png">
<p>短袖衬衣4</p>
<p class="price">8.88</p>
<div class="add2cart">
<button>添加到购物车</button>
</div>
</li>
</ul>
<a href="res.html">去结算</a>
</body>
</html>
<!--购物车页面 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>购物车</title>
<style>
#carList li{
position:relative;
padding-bottom:15px;
margin-bottom:15px;
border-bottom:1px solid #ddd;
}
#carList img{
display:block;
width:100px;
}
#carList li .btn-close{
position:absolute;
top:0;
right:0;
padding:0 5px;
cursor:default;
}
#carList li .btn-close:hover{
background-color:#f00;
color:#fff;
}
.subPrice{
padding:5px 20px;
color:#f00;
font-weight:900;
text-align:right;
}
#carList .price{
color:#f00;
}
.price::before{
content:'￥';
font-size:11px;
}
#carList .price span{
font-size:11px;
}
</style>
<script src ="../cookie.js"></script>
<script>
window.onload = function(){
/*
读取cookie中的carlist
把json字符串转换成对象/数组：JSON.parse()
json字符串格式：
1.必须用双引号
2.不能右注释
*/
var oCarList = document.getElementById('carList');
var oSubPrice = oCarList.nextElementSibling;
var btnClear = document.getElementById('btnClear');
var carList;
var cookies = document.cookie.split('; ');
for(var i=0;i<cookies.length;i++){
var arr = cookies[i].split('=');
if(arr[0] === 'carlist'){
console.log(JSON.parse(arr[1]));
carList = JSON.parse(arr[1]);
}
}
// getcookie(carList);
var subPrice = 0;
if(carList){
var ul = document.createElement('ul');
for(var i=0;i<carList.length;i++){
var li = document.createElement('li');
// 给每个li添加data-guid属性
li.setAttribute('data-guid',carList[i].guid);

// 商品名
var title = document.createElement('h4');
title.innerHTML = carList[i].name;

// 商品价格
var price = document.createElement('p');
price.className = 'price';
price.innerHTML = carList[i].price +" X "+ carList[i].qty;

// 商品图片
var img = document.createElement('img');
img.src = carList[i].imgUrl;

// 添加删除按钮
var btnClose = document.createElement('span');
btnClose.innerHTML = '&times;';
btnClose.className = 'btn-close';

// 计算总价
subPrice += carList[i].price*carList[i].qty;
li.appendChild(title);
li.appendChild(price);
li.appendChild(img);
li.appendChild(btnClose);
ul.appendChild(li);
}
// 写入页面
oCarList.appendChild(ul);

// 写入总价
// toFixed(n)获取小数点后n位（自动四舍五入，Number类型的方法）
oSubPrice.innerHTML = '<span class="price">' + subPrice.toFixed(2) + '</span>';
}
// 删除商品
oCarList.onclick = function(e){
e = e || window.event;
var target = e.target || e.srcElement;

// 是否点击了删除按钮
if(target.className === 'btn-close'){
var currentLi = target.parentElement;
// 获取当前guid
var currentGUID = currentLi.getAttribute('data-guid');
 
// 删除cookie中对应的商品
// 根据guid取对比
for(var i=0;i<carList.length;i++){
// 找出要删除的商品
if(carList[i].guid === currentGUID){
carList.splice(i,1);
break;
}
}

// 更新cookie
document.cookie = 'carlist=' + JSON.stringify(carList);

// 删除li节点
currentLi.parentElement.removeChild(currentLi);
}
}

// 清空购物车
// 1、删除DOM节点
// 2、删除cookie
btnClear.onclick = function(){
oCarList.innerHTML = '';
oSubPrice.innerHTML = '';

// 利用设置有效期位过期事件来达到删除cookie的效果
var now = new Date();
now.setDate(now.getDate()-7);
document.cookie = 'carlist=xx;expires=' + now;
}
}

</script>
</head>
<body>
<h1>购物车</h1>
<div id="carList">

</div>
<div class="subPrice"></div>
<a href="#" id="btnClear">清空购物车</a>
</body>
</html>

 

 
posted @ 2019-05-09 10:37  慢慢变菜  阅读(941)  评论(4)  编辑  收藏  举报