javascript操作cookies

1、读取cookies

getCookie: function(c_name){
    if (document.cookie.length > 0) {
        var c_start = document.cookie.indexOf(c_name + "=")
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return ""
}

2、写入cookies

setCookie: function(c_name,value,expiredays){
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : "; expires=" + exdate.toGMTString());
}

3、检查cookies

checkCookie: function(c_name){
    var _self = this,
        cookie_map = unescape(_self.getCookie(c_name));

    if (cookie_map != null && cookie_map != "")
    {
        alert(+cookie_map+);
    }
    else
    {
        cookie_map=prompt('Please enter your name:',"")
        if (cookie_map!=null && cookie_map!="")
        {
           setCookie(c_name,cookie_map,365)
        }
    }
}

4、删除cookies

delCookie: function(c_name){
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cookie_map = this.getHistoryCookie(c_name);
    if(cookie_map != null){
        document.cookie = c_name + "=" + cookie_map + ";expires=" + exp.toGMTString();
    }
}