cookie的使用

function Cookie() {};
    Cookie.prototype = {
        constructor: Cookie,
        _path: "/",
        expire: new Date(),
        setPath: function(path) {
            this._path = !path ? this._path : path;
        },
        getPath: function() {
            return this._path;
        },
        set: function(name, value, day) {
            if (this.get(name)) this.del(name);
            day = day ? day : 0;
            this.expire.setTime(this.expire.getTime() + day * 24 * 3600 * 1000);
            document.cookie = name + "=" + escape(value) + (day != 0 ? ";expires=" + this.expire.toGMTString() : "") + ";path=" + this.getPath();
        },
        get: function(name) {
            var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
            if (arr != null) {
                return unescape(arr[2]);
            }
        },
        del: function(name) {
            if (this.get(name)) {
                document.cookie = name + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT;path=" + this.getPath();
            }
        },
        delAll: function() {
            var arr = document.cookie.match(/[^ =;]+(?==)/g);
            if (arr) {
                for (var i = arr.length; i--;) {
                    this.del(arr[i]);
                }
            }
        }
    };
    var cookie = new Cookie();
    cookie.set('flag', 'audit');