js 操作 cookie

//设置cookie
        function setCookie(cookieName,coojieValue,cookieHour)
        {
            if(cookieName==null)
            {
                alert("请填写cookie名字");
                return false;
            }
            else if(coojieValue==null)
            {
                alert("请填写cookie值");
                return false;
            }
            else if(cookieHour!=null)
            {
                var str=cookieName+"="+escape(coojieValue);
                var date=new Date();
                date.setTime(date.getTime()+3600*1000*cookieHour);
                str+=";expires="+date.toGMTString();
                document.cookie=str;
                alert("添加cookie成功");
                return ;
            }
           
            else
            {
                var date=new Date();
                date.setTime(date.getTime()+3600*1000);
                document.cookie=cookieName+"="+coojieValue+";expires="+date.toGMTString();
                alert("添加cookie成功");
                return ;
            }
        }
       
        //获取cookie
        function getCookie(cookieName)
        {
            var cookieObj=document.cookie.split('; ');
            for(var i=0; i<cookieObj.length; i++)
            {
               var cookie=cookieObj[i];
               var cookieList=cookie.split('=');
               var name=cookieList[0];
               var value=cookieList[1];
                if(name==cookieName)
                {
                   alert(name);     
                }       
            }
        }
       
        //只有一个cookie时候清除cookie
        function delCookie(cookieName)
        {
            var cookieObj=document.cookie.split('; ');
            var date=new Date();
                date.setTime(date.getTime()-1000)

            document.cookie=cookieName+"=;expires="+date.toGMTString();
        }
       
        //获取所有cookie
        function getAllCookie()
        {
            var cookies=document.cookie;
            if(cookies=="")
            {
                alert("没有cookie");
            }
            else
            {
                alert(document.cookie);
            }
        }
       
        //多个cookie获取特定的cookie值
        function getTheOne(cookieName)
        {
            var cookies=document.cookie.split('; ');
            for(var i=0; i<cookies.length; i++)
            {
                var name=cookies[i].split('=')[0];
                var value=cookies[i].split('=')[1];
                if(name==cookieName)
               {
                alert(value);
               }
            }
        }
       
        //清除所有cookie
        function clearAllCookie()
        {
            var cookies=document.cookie.split('; ');
            try
            {
                for(var i=0;i<cookies.length;i++)
                {
                    var cookie=cookies[i];
                    var cookieName=cookie.split('=');
                    var date=new Date();
                    date.setTime(date.getTime()-10000);
                    document.cookie=cookieName[0]+"="+";expires="+date.toGMTString();
                }
                alert("清除cookie成功");
            }
            catch(e)
            {
               alert("清除cookie失败");
            }
           
        }