Cookie操作

cookie.js

createCookie = function(){
        var cookie = new Object();
        cookie.set = function(name, value, duration){
            if(name!=null && name!='' && value!=null && value!=''){
                var exp = new Date();
                exp.setDate(exp.getDate()+duration);
                document.cookie = name+'='+value+((duration==null)? "":";expires="+exp.toGMTString());
            }
        }
        cookie.get = function(name){
            if(document.cookie.length>0){
                var start = document.cookie.indexOf(name+'=');
                var value = '';
                if(start != -1){
                    start += name.length+1;
                    var end = document.cookie.indexOf(';', start);
                    if(end == -1){
                        end = document.cookie.length;
                    }
                    value = document.cookie.substring(start, end);
                }
            }
            return value;
        }
        cookie.del = function(name){
            var exp = new Date();
            exp.setTime(exp.getTime() - 1);
            var duration= this.get(name);
            if(duration!=null) document.cookie= name + "="+duration+";expires="+exp.toGMTString();
        }
        cookie.check = function(name){
            var value = this.get(name);
            if(value != null && value != ''){
                return true;
            }
            return false;
        }
        return cookie;
    }