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

 1  jQuery.cookie = function(name, value, options) {
 2     if (typeof value != 'undefined') { // name and value given, set cookie
 3         options = options || {};
 4         if (value === null) {
 5             value = '';
 6             options.expires = -1;
 7         }
 8         var expires = '';
 9         if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
10             var date;
11             if (typeof options.expires == 'number') {
12                 date = new Date();
13                 date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
14             } else {
15                 date = options.expires;
16             }
17             expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
18         }
19         var path = options.path ? '; path=' + options.path : '';
20         var domain = options.domain ? '; domain=' + options.domain : '';
21         var secure = options.secure ? '; secure' : '';
22         document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
23     } else { // only name given, get cookie
24         var cookieValue = null;
25         if (document.cookie && document.cookie != '') {
26             var cookies = document.cookie.split(';');
27             for (var i = 0; i < cookies.length; i++) {
28                 var cookie = jQuery.trim(cookies[i]);
29                 // Does this cookie string begin with the name we want?
30                 if (cookie.substring(0, name.length + 1) == (name + '=')) {
31                     cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
32                     break;
33                 }
34             }
35         }
36         return cookieValue;
37     }
38 };
39 function getcookie(name) {
40     var cookie_start = document.cookie.indexOf(name);
41     var cookie_end = document.cookie.indexOf(";", cookie_start);
42     return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));
43 }
44 function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
45     var expires = new Date();
46     expires.setTime(expires.getTime() + seconds);
47     document.cookie = escape(cookieName) + '=' + escape(cookieValue)
48                                             + (expires ? '; expires=' + expires.toGMTString() : '')
49                                             + (path ? '; path=' + path : '/')
50                                             + (domain ? '; domain=' + domain : '')
51                                             + (secure ? '; secure' : '');
52 }
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

posted on 2015-05-24 03:06  Questionfeet  阅读(1136)  评论(0)    收藏  举报

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