自己最近封装的cookie的设置，获取，和清除

    /*
             * key=value存储的键值对
             * overTime 过期时间
             * */
            //设置过期时间            
            function getDate(n) {
                var oDate = new Date();
                oDate.setDate(oDate.getDate() + n);
                return oDate;

            }

            function getCookie(Key) { //获取cookie
                var myCookie = document.cookie;

                if(myCookie) { //判断cookie是否为空

                    var arr = myCookie.replace(/\s/g, "").split(";"); //去空和字符串分割
                    for(var i = 0; i < arr.length; i++) {
                        var arr1 = arr[i].split("="); //字符串分割
                        if(arr1[0] == key) {
                            return decodeURIComponent(arr1[1]); //返回的值；

                        }
                    }
                } else {
                    return " ";
                }
            }

            function setCookie(key, value, overTime) { //存取cookie
                document.cookie = key + "=" + encodeURI(value) + ";expires=" + getDate(n);
            }

            function delCookie(key) { //清空cookie
                setCookie(key, " ", -1);

            }