简单3步 js使用cookie实现的购物车功能[原创]

引入JQuery.js支持

加入JQuery.Cookie.js，代码如下

jQuery.cookie = function(name, value, options) {
if (typeof value != 'undefined') { // name and value given, set cookie
options = options || {};
if (value === null) {
value = '';
options.expires = -1;
}
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
var path = options.path ? '; path=' + options.path : '';
var domain = options.domain ? '; domain=' + options.domain : '';
var secure = options.secure ? '; secure' : '';
document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
} else { // only name given, get cookie
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
// Does this cookie string begin with the name we want?
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};
function getcookie(name) {
var cookie_start = document.cookie.indexOf(name);
var cookie_end = document.cookie.indexOf(";", cookie_start);
return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));
}
function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
var expires = new Date();
expires.setTime(expires.getTime() + seconds);
document.cookie = escape(cookieName) + '=' + escape(cookieValue)
+ (expires ? '; expires=' + expires.toGMTString() : '')
+ (path ? '; path=' + path : '/')
+ (domain ? '; domain=' + domain : '')
+ (secure ? '; secure' : '');
}

View Code
加入购物车功能脚本shop.car.js，代码如下

var shop = {};
shop.addProduct = function (id, name, price, count) {
var carInfo = shop.readData();
if (carInfo[id]) {
carInfo[id].count = (parseInt(count) + parseInt(carInfo[id].count));
}
else {
carInfo[id] = { id: id, name: name, price: price, count: count };
}
shop.saveData(carInfo);
};

shop.removeProduct = function (id) {
var carInfo = shop.readData();
for (var i in carInfo) {
if (i == id) {
carInfo[i] = undefined;
}
}
shop.saveData(carInfo);
};

shop.saveData = function (info) {
var infoStr = "";
for (var i in info) {
var element = info[i];
if (element) {
infoStr += info[i].id + "," + info[i].name + "," + info[i].price + "," + info[i].count + ";";
}
}
var shop_car = $.cookie("shop-car", infoStr);
};

shop.readData = function () {
var shop_car = $.cookie("shop-car");
var reInfo = {};
if (shop_car) {
shop_car = shop_car.split(";");
for (var i = 0 ; i < shop_car.length; i++) {
if (shop_car[i]) {
shop_car[i] = shop_car[i].split(",");
reInfo[shop_car[i][0]] = { id: shop_car[i][0], name: shop_car[i][1], price: shop_car[i][2], count: shop_car[i][3] };
}
}
}

return reInfo;
}

//得到总价格 update 2016-3-31 14:35:03 by Questionfeet
shop.getPrice = function () {
var price = 0;
var shop_car = $.cookie("shop-car");
var reInfo = {};
if (shop_car) {
shop_car = shop_car.split(";");
for (var i = 0 ; i < shop_car.length; i++) {
if (shop_car[i]) {
shop_car[i] = shop_car[i].split(",");
for (var j = 0; j < parseInt(shop_car[i][3]) ; j++) {
price += parseInt(shop_car[i][2]);
}
}
}
}
return price;
}

///设置数量，count可以为负数 update 2016-3-31 14:35:03 by Questionfeet
shop.setCount = function (id, count) {
var carItems = shop.readData()
for (var i in carItems) {
if (i == id) {
shop.addProduct(id, carItems[i].name, carItems[i].price, count);
}

}
}

//得到总数量 update 2016-3-31 14:35:03 by Questionfeet
shop.getCount = function () {
var count = 0;
var shop_car = $.cookie("shop-car");
var reInfo = {};
if (shop_car) {
shop_car = shop_car.split(";");
for (var i = 0 ; i < shop_car.length; i++) {
if (shop_car[i]) {
shop_car[i] = shop_car[i].split(",");
count += parseInt(shop_car[i][3]);
}
}
}
return count;
}

shop.clear = function () {
$.cookie("shop-car", "");
return;
}

　　

完成以上步骤，简易而强大的前端购物车已经加入项目中了。

code by questionfeet