cookie操作

var CookieUtil = {
    get: function(name) {
        var cookieName = encodeURIComponent(name) + "=",
            cookieStart = document.cookie.indexOf(cookieName),
            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: 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) {
            cookieText += "; secure";
        }

        document.cookie = cookieText;
    },

    unset: function(name, path, domain, secure) {
        this.set(name, "", new Date(0), path, domain, secure);
    }
};

使用方法

//设置cookie
CookieUtil.set("name", "Nicholas");
CookieUtil.set("book", "Professional JavaScript");

//读取
console.log(CookieUtil.get("name"));
console.log(CookieUtil.get("book"));

//删除cookie
CookieUtil.unset("name");
CookieUtil.unset("book");

//设置1个cookie,包括它的路径、域、截止日期
CookieUtil.set("name", "Nicholas", "/books/projs/", "www.wrox.com", new Date("January 1, 2010"));

//删除同一cookie
CookieUtil.unset("name", "/books/projs/", "www.wrox.com");

//设置1个安全cookie
CookieUtil.set("name", "Nicholas", null, null, null, true);