JS常用函数

1、比较时间

//比较时间,格式yyyy-MM-dd
//小于0前者大于后者,大于0前者小于后者,等于0两者相等
function CompareTime(startTime, endTime) {
    var startArr = startTime.split("-");
    var starttime = new Date(startArr[0], startArr[1], startArr[2]);
    var starttimes = starttime.getTime();

    var endArr = endTime.split("-");
    var endtime = new Date(endArr[0], endArr[1], endArr[2]);
    var endtimes = endtime.getTime();

    if (starttimes > endtimes) {
        return -1;
    }
    else if (starttimes == endtimes) {
        return 0;
    }
    else {
        return 1;
    }
}

//日期格式yyyy-mm-dd HH:mm:ss(未验证整理)
function comptime() {
    var beginTime = "2009-09-21 00:00:00";
    var endTime = "2009-09-21 00:00:01";
    var beginTimes = beginTime.substring(0, 10).split('-');
    var endTimes = endTime.substring(0, 10).split('-');

    beginTime = beginTimes[1] + '-' + beginTimes[2] + '-' + beginTimes[0] + ' ' + beginTime.substring(10, 19);
    endTime = endTimes[1] + '-' + endTimes[2] + '-' + endTimes[0] + ' ' + endTime.substring(10, 19);

    alert(beginTime + "aaa" + endTime);
    alert(Date.parse(endTime));
    alert(Date.parse(beginTime));
    var a = (Date.parse(endTime) - Date.parse(beginTime)) / 3600 / 1000;
    if (a < 0) {
        alert("endTime小!");
    } else if (a > 0) {
        alert("endTime大!");
    } else if (a == 0) {
        alert("时间相等!");
    } else {
        return 'exception'
    }
}