原生JS 购物车及购物页面的cookie使用

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>购物页面</title>
<style>
ul{list-style:none;padding:0;margin:0;}
.goods li{display:inline-block;border:1px solid #ddd;padding:10px;margin:10px;}
.goods li:hover{background-color:#efefef;}
.goods .price{color:#f00;font-weight:bold;}
.goods .price::before{
content:"￥";
}
</style>
<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]);
}
}

// 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.toLowerCase() === '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/shirt_1.jpg">
<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/shirt_2.jpg">
<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/shirt_3.jpg">
<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/shirt_4.jpg">
<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="04car.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;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:bold;text-align:right;}
#carList .price{color:#f00;}
.price::before{
content:'￥';
font-size:11px;
}
#carList .price span{font-size:11px;}
</style>
<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]);
}
}

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 + '×' + 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 = '×';
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>

这篇文章主要介绍了jquery.cookie实现的客户端购物车操作,结合实例形式分析了jQuery基于cookie存储及操作数据实现购物车功能的技巧,需要的朋友可以参考下

本文实例讲述了jquery.cookie实现的客户端购物车操作。分享给大家供大家参考，具体如下：

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//购物车
var Cart = function () {
  this.Count = 0;
  this.Total = 0;
  this.Items = new Array();
};
//购物车集合对象
var CartItem = function () {
  this.Id = 0;
  this.Name = "";
  this.Count = 0;
  this.Price = 0;
};
  
//购物车操作
var CartHelper = function () {
  this.cookieName = "yxhCart";
  this.Clear = function () {
    var cart = new Cart();
    this.Save(cart);
    return cart;
  };
  //向购物车添加
  this.Add = function (id, name, count, price) {
    var cart = this.Read();
    var index = this.Find(id);
    //如果ID已存在，覆盖数量
    if (index > -1) {
      cart.Total -= (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
      cart.Items[index].Count = count;
      cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
    } else {
      var item = new CartItem();
      item.Id = id;
      item.Name = name;
      item.Count = count;
      item.Price = price;
      cart.Items.push(item);
      cart.Count++;
      cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
    }
    this.Save(cart);
    return cart;
  };
  //改变数量
  this.Change = function (id, count) {
    var cart = this.Read();
    var index = this.Find(id);
    cart.Items[index].Count = count;
    this.Save(cart);
    return cart;
  };
  //移出购物车
  this.Del = function (id) {
    var cart = this.Read();
    var index = this.Find(id);
    if (index > -1) {
      var item = cart.Items[index];
      cart.Count--;
      cart.Total = cart.Total - (((item.Count * 100) * (item.Price * 100)) / 10000);
      cart.Items.splice(index, 1);
      this.Save(cart);
    }
    return cart;
  };
  //根据ID查找
  this.Find = function (id) {
    var cart = this.Read();
    var index = -1;
    for (var i = 0; i < cart.Items.length; i++) {
      if (cart.Items[i].Id == id) {
        index = i;
      }
    }
    return index;
  };
  //COOKIE操作
  this.Save = function (cart) {
    var source = "";
    for (var i = 0; i < cart.Items.length; i++) {
      if (source != "") { source += "|$|"; }
      source += this.ItemToString(cart.Items[i]);
    }
    $.cookie(this.cookieName, source);
  };
  this.Read = function () {
    //读取COOKIE中的集合
    var source = $.cookie(this.cookieName);
    var cart = new Cart();
    if (source == null || source == "") {
      return cart;
    }
    var arr = source.split("|$|");
    cart.Count = arr.length;
    for (var i = 0; i < arr.length; i++) {
      var item = this.ItemToObject(arr[i]);
      cart.Items.push(item);
      cart.Total += (((item.Count * 100) * (item.Price * 100)) / 10000);
    }
    return cart;
  };
  this.ItemToString = function (item) {
    return item.Id + "||" + escape(item.Name) + "||" + item.Count + "||" + item.Price;
  };
  this.ItemToObject = function (str) {
    var arr = str.split('||');
    var item = new CartItem();
    item.Id = arr[0];
    item.Name = unescape(arr[1]);
    item.Count = arr[2];
    item.Price = arr[3];
    return item;
  };
};