js操作cookie

JavaScript处理cookie

//取cookie值
        getCookie: function(cname) {
            var allcookies = document.cookie;
            //索引长度，开始索引的位置
            var cookie_pos = allcookies.indexOf(cname);
            // 如果找到了索引，就代表cookie存在,否则不存在
            if (cookie_pos != -1) {
                // 把cookie_pos放在值的开始，只要给值加1即可
                //计算取cookie值得开始索引，加的1为“=”
                cookie_pos = cookie_pos + cname.length + 1;
                //计算取cookie值得结束索引
                var cookie_end = allcookies.indexOf(";", cookie_pos);
                if (cookie_end == -1) {
                    cookie_end = allcookies.length;
                }
                //得到想要的cookie的值
                var value = unescape(allcookies.substring(cookie_pos, cookie_end));
            }
            return value;
        },
        //设置cookie值
        setCookie: function(cname, cvalue, exdays) {
            if (!exdays) {
                exdays = 1;
            }
            var d = new Date();
            d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
            var expires = "expires=" + d.toUTCString();
            //console.info(cname + "=" + cvalue + "; " + expires);
            document.cookie = cname + "=" + cvalue + "; " + expires + "; path=/";
            //console.info(document.cookie);
        },
        // 清除Cookies
        clearCookies: function(cname) {
            if (!cname) {
                //清除所有
                var keys = document.cookie.match(/[^ =;]+(?=\=)/g);
                if (keys) {
                    for (var i = keys.length; i--;) {
                        document.cookie = keys[i] + '=0;expires=' + new Date(0).toUTCString() + "; path=/";
                    }
                }
            } else {
                //清除单个时
                common.setCookie(cname, '', -1);
            }
        },