Cookie操作

/*
 * @param  name{string}          设置cookie名
 * @param  value{string}         设置cookie值
 * @param  options{object}       设置其他配置参数
 *
 * options.expires               过期时间（ms）
 * options.path                  路径
 * options.domain                域名
 * options.secure                secure值为true时，在http中无效，在https中有效
 */

function Cookie(name, value, options){
    if(typeof value != ‘undefined‘){
        options = options || {};
        if(value === null){
            options.expires = -1; //过期
        }
        var expires = ‘‘;
        //存在时间选项
        if(options.expires && (typeof options.expires == ‘number‘ || options.expires.toUTCString)){
            var date;
            if(typeof options.expires == ‘number‘){
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            }else{
                date = options.expires;
            }
            expires = ‘; expires=‘+date.toUTCString();
        }
        var path = options.path ? ‘; path=‘+options.path : ‘‘;
        var domain = options.domain ? ‘; domain=‘+options.domain : ‘‘;
        var secure = options.secure ? ‘; secure‘ : ‘‘;
        //写入cookie
        document.cookie = [name, ‘=‘, encodeURIComponent(value), expires, path, domain, secure].join(‘‘);
    }else{//读取cookie
        var cookValue = null;
        if(document.cookie && document.cookie != ‘‘){
            var cookie = document.cookie.split(‘;‘);
            for(var i = 0, len = cookie.length; i < len; i++){
                var cookie = cookie[i].replace(/^\s+|\s+$/g, ‘‘);
                if(cookie.substring(0, name.length + 1) == (name + ‘=‘)){
                    cookValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookValue;
    }
}

//设置
Cookie("user", "小七");
//获取
Cookie("user");
//删除
Cookie("user", null);