javascipt原生设置cookie封装的模块，可以直接使用，适合大部分浏览器

var CookieUtil = {
    //依据名称取得cookie值  例如 CookieUtil.set("data", "name=nic&book=pageXOffset%20js"); alert(CookieUtil.get("data"));
    get: function (name) {
        var cookieName = encodeURIComponent(name) + "=",
            cookieStart = document.cookie.indexOf(cookieName),//document.cookie的属性
            cookieValue = null;
        if (cookieStart > -1) {
            var cookieEnd = document.cookie.indexOf(";", cookieStart);
            if (cookieEnd == -1) {
                cookieEnd = document.cookie.length;
            }
            cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
        }
        return cookieValue;
    },
    //Set-Cookie:name=value;expires:Mon,22-Jan-07 07:10:24 GMT;domain=.wrox.com;path=/;secure
    //设置cookie
    set: function (name,value,expires,path,domain,secure) {
        var cookieText = encodeURIComponent(name) + "=" + encodeURIComponent(value);
        if (expires instanceof Date) {
            cookieText += ";expires=" + expires.toGMTString();
        }
        if (path) {
            cookieText += ";path=" + path;
        }
        if (domain) {
            cookieText += ";domain=" + domain;
        }
        if (secure) {//使用ssl
            cookieText += ";secure";
        }
        document.cookie = cookieText;
    },
    //取消cookie（使cookie值过期）
    unset: function (name, path, domain, secure) {
        this.set(name, "", new Date(0), path, domain, secure);
    }
}
//子cookie使用cookie值来存储多个名称值对形如name=name1=value1&name2=value2&name3=value3
//例如 var data = SubCookieUtil.getAll("data");
//alert(data.name);
//alert(data.book);
var SubCookieUtil = {
    //取得cookie值及其子cookie
    get: function (name, subName) {
        var subCookies = this.getAll(name);
        if (subCookies)
            return subCookies[subName];
        else
            return null;
    },
    //取到全部子cookie对象
    getAll: function (name) {
        var cookieName = encodeURIComponent(name) + "=",
            cookieStart = document.cookie.indexOf(cookieName),
            cookieValue = null,
            cookieEnd,
            subCookies, i, parts, result = {};
        if (cookieStart > -1) {
            cookieEnd = document.cookie.indexOf(";", cookieStart);
            if (cookieEnd == -1) {
                cookieEnd = document.cookie.length;
            }
            cookieValue = document.cookie.substring(cookieStart + cookieName.length, cookieEnd);
            if (cookieValue.length > 0) {
                subCookies = decodeURIComponent(cookieValue).split("&");
                for (i = 0, len = subCookies.length; i < len; i++) {
                    parts = subCookies[i].split("=");
                    result[decodeURIComponent(parts[0])] = decodeURIComponent(parts[1]);
                }
                return result;
            }
        }
        return null;
    },
    //设置子cookie
    set: function (name,subName,value,expires,path,domain,secure) {
        var subcookies = this.getAll(name) || {};
        subcookies[subName] = value;
        this.setAll(name,subcookies,expires,path,domain,secure);
    },

    setAll: function (name,subcookies,expires,path,domain,secure) {
        var cookieText = encodeURIComponent(name) + "=",
            subcookieParts = new Array(),
            subName;
        for (subName in subcookies) {
            if (subName.length > 0 && subcookies.hasOwnProperty(subName)) {
                subcookieParts.push(encodeURIComponent(subName) + "=" + encodeURIComponent(subcookies[subName]));
            }
        }
        if (cookieParts.length > 0) {
            cookieText += subcookieParts.join("&");

            if (expires instanceof Date) {
                cookieText += ";expires=" + expires.toGMTString();
            }
            if (path) {
                cookieText += ";path=" + path;
            }
            if (domain) {
                cookieText += ";domain=" + domain;
            }
            if (secure) {
                cookieText == ";secure";
            }
        } else {
            cookieText += ";expires=" + (new Date(0)).toGMTString();
        }
        document.cookie = cookieText;
    },
    //注销子cookie
    unset: function (name,subName,path,domain,secure) {
        var subcookies = this.getAll(name);
        if (subcookies) {
            delete subcookies[subName];
            this.setAll(name, subcookies, null, path, domain, secure);
        }
    },
    unsetAll: function (name, path, domain, secure) {
        this.setAll(name, null, new Date(0), path, domain, secure);
    }
}