js封装Cookie操作

var CookieUtil = {
        // 设置cookie
        set : function (name, value, expires, domain, path, secure) {
            var cookieText = "";
            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) {
                cookieText += "; secure";
            }
            document.cookie = cookieText;
        },
        // name=value; expires=expiration_time; path=domain_path; domain=domain_name; secure
        // 获取cookie
        get : function (name) {
            var cookieName = encodeURIComponent(name) + "=",
                cookieStart = document.cookie.indexOf(cookieName),
                cookieValue = "";
            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; 
        },
        // 删除cookie
        unset : function (name, domain, path, secure) {
            this.set(name, "", Date(0), domain, path, secure);
        }
    };
    // 测试
    CookieUtil.set("name", "zhang");
    var name = CookieUtil.get("name");
    alert(name);    // zhang
    CookieUtil.unset("name");
    alert(CookieUtil.get("name"));  // 空









针对cookie数据存储少量的问题，我们提出了子cookie的概念。即在每条cookie的值中存储多条数据，用"&"隔开。

    var SubCookieUtil = {
        /** 设置一条完整的cookie
        *   param name : 表示cookie的名称，必填
        *   param subCookies : 表示cookie的值，为一个对象，必填
        *   param expires : 表示cookie的过期时间，可以不填
        *   param domain : 表示cookie的域名，可以不填
        *   param path : 表示cookie的路径，可以不填
        *   param secure : 表示cookie的安全标志，可以不填
        *   eg : SubCookieUtil.setAll("info", { name : "zhang", age : 23});
        **/
        setAll : function (name, subCookies, expires, domain, path, secure) {
            var cookieText = "", subName, cookieParts = [];
            cookieText += encodeURIComponent(name) + "=";
            for(subName in subCookies) {
                cookieParts.push(encodeURIComponent(subName) + "=" + encodeURIComponent(subCookies[subName]));
            }
            if (cookieParts.length > 0) {
                cookieText += cookieParts.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=" + Date(0).toGMTString();
            }
            document.cookie = cookieText;
        },
        /** 设置一条子cookie
        *   param name : 表示cookie的名称，必填
        *   param subName : 表示子cookie的名称，必填
        *   param value : 表示子cookie的值，必填
        *   param expires : 表示cookie的过期时间，可以不填
        *   param domain : 表示cookie的域名，可以不填
        *   param path : 表示cookie的路径，可以不填
        *   param secure : 表示cookie的安全标志，可以不填
        *   eg : SubCookieUtil.set("info", "sex", "boy");
        **/
        set : function (name, subName, value, expires, domain, path, secure) {
            var cookies = this.getAll(name) || {};
            cookies[subName] = value;
            this.setAll(name, cookies, expires, domain, path, secure);
        },
        /** 读取一条完整cookie
        *   param name : 表示cookie的名称，必填
        *   return : 一个cookie对象
        *   eg : SubCookieUtil.getAll("info");
        **/
        getAll : function (name) {
            var cookieName = encodeURIComponent(name) + "=",
                cookieStart = document.cookie.indexOf(cookieName),
                cookieValue = "", i, len, subCookies, parts, result = {};
            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));
                if (cookieValue.length > 0) {
                    subCookies = 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;
        },
        /** 获取一条子cookie的值
        *   param name : 表示cookie的名称，必填
        *   param subName : 表示子cookie的名称
        *   return : 一个子cookie的值
        *   eg : SubCookieUtil.get("info", "name");
        **/
        get : function (name, subName) {
            var cookies = this.getAll(name);
            if (cookies) {
                return cookies[subName];
            } else {
                return null;
            }
        }, 
        /** 删除一条完整cookie
        *   param name : 表示cookie的名称，必填
        *   param domain : 表示cookie的域名，可以不填
        *   param path : 表示cookie的路径，可以不填
        *   param secure : 表示cookie的安全标志，可以不填
        *   eg : SubCookieUtil.unsetAll("info");
        **/
        unsetAll : function (name, domain, path, secure) {
            this.setAll(name, "", Date(0).toGMTString(), domain, path, secure);
        },
        /** 删除一条子cookie
        *   param name : 表示cookie的名称，必填
        *   param subName : 表示子cookie的名称，必填
        *   param domain : 表示cookie的域名，可以不填
        *   param path : 表示cookie的路径，可以不填
        *   param secure : 表示cookie的安全标志，可以不填
        *   eg : SubCookieUtil.unset("info", "name");
        **/
        unset : function (name, subName, domain, path, secure) {
            var cookies = this.getAll(name);
            if (cookies) {
                delete cookies[subName];
                this.setAll(name, cookies, null, domain, path, secure);
            }
        }   
    };
    // 测试：
    var zhang = {
        name : "zhang",
        age : 23,
        height : "178cm",
        weight : "66kg"
    }
    // 设置一条完整的cookie
    SubCookieUtil.setAll("zhang", zhang);
    // 获取一条完整的cookie
    var zhang = SubCookieUtil.getAll("zhang");
    alert(zhang.weight);    // 66kg
    // 再为张添加一个子cookie
    SubCookieUtil.set("zhang", "sport", "basketball");
    // 获取子cookie
    alert(SubCookieUtil.get("zhang", "sport")); // basketball
    // 删除一条子cookie
    SubCookieUtil.unset("zhang", "age");
    alert(SubCookieUtil.get("zhang", "age"));   // undefined
    // 删除一条完整的cookie
    SubCookieUtil.unsetAll("zhang");
    alert(SubCookieUtil.getAll("zhang"));   // 报错，因为已经被删除