js 比较日期大小

 //1获取当前时间
            var curTime = new Date();

            //2把字符串格式转换为日期类
            var startTime = new Date(Date.parse(kc.begintime));
            var endTime = new Date(Date.parse(kc.endtime));

            //3进行比较
            return (curTime>=startTime && curTime<=endTime);