《JavaScript权威指南》中的一个Cookie工具

《JavaScript权威指南》（第五版）中的一个Cookie工具，但是其中一处代码在IE下有问题，关掉所有IE窗口后cookie value没有保存。

原因是IE6,7,8,9都没有很好的支持max-age属性，所以针对IE使用expires属性代替。

以下是我修改后的代码。

Cookie.js

 function Cookie(name){
    this.$name = name;
    var allcookies = document.cookie;
    if(allcookies=="")  return;
    var cookies = allcookies.split(';');
    var cookie = null;
    for(var i=0; i<cookies.length; i++){
        if(cookies[i].substring(0,name.length+1)==(name+"=")){
            cookie = cookies[i];
            break;
        }
    }
    if(cookie==null)    return;
    var cookieval = cookie.substring(name.length+1);
    var a = cookieval.split('&');
    for(var i=0; i<a.length; i++)
        a[i] = a[i].split(':');
    for(var i=0;i<a.length;i++){
        this[a[i][0]] = decodeURIComponent(a[i][1]);    
    }
}

Cookie.prototype.store = function(daysToLive,path,domain,secure){
    var  cookieval = "";
    for(var prop in this){
        if((prop.charAt(0)=='$')||(typeof this[prop] == 'function'))
            continue;
        if(cookieval!="") cookieval += '&';
        cookieval += prop + ':' + encodeURIComponent(this[prop]);
    }
    var cookie = this.$name + "=" + cookieval;
    if(daysToLive||daysToLive==0){
        if(window.ActiveXObject){   //update for ie 6,7,8,9
            var nDaysLater = (new Date()).getTime() + (daysToLive*24*60*60*1000);
            cookie += "; expires=" + (new Date(nDaysLater)).toGMTString();
        }
        else
            cookie += "; max-age=" + (daysToLive*24*60*60);
    }
    if(path)    cookie += "; path=" + path;
    if(domain)  cookie += "; domain" + domain;
    if(secure)  cookie += "; secure";
    document.cookie = cookie;
}
Cookie.prototype.remove = function(path,domain,secure){
    for(var prop in this){
        if(prop.charAt(0)!='$' && typeof this[prop]!='function')
            delete this[prop];
    }
    this.store(0,path,domain,secure);
}
Cookie.enabled = function(){
    if(navigator.cookieEnabled != undefined)    return navigator.cookieEnabled;
    if(Cookie.enabled.cache != undefined)   return Cookie.enabled.cache;
    if(window.ActiveXObject)    //update for ie 6,7,8,9
        document.cookie = "testcookie=test; expires=" + (new Date((new Date()).getTime() + (10000*1000))).toGMTString();
    else
        document.cookie = "testcookie=test; max-age=10000";
    var cookies = document.cookie;
    if(cookies.indexOf("testcookie=test") == -1){
        return Cookie.enabled.cache = false;
    }else{
        if(window.ActiveXObject)    //update for ie 6,7,8,9
            document.cookie = "testcookie=test; expires=" + (new Date((new Date()).getTime() - (10000*1000))).toGMTString();
        else
            document.cookie = "testcookie=test; max-age=0";
        return Cookie.enabled.cache = true;
    }
}