js算時間戳差值相隔多長時間

function transTime(time) {
	if(time === '') {
		return '';
	} else {
		var result = '';
		if(time >= 1000) {
			var day = parseInt(time / (24*60*60*1000));
			var hour = parseInt((time % (24*60*60*1000)) / (60*60*1000));
			var minute = parseInt(((time % (24*60*60*1000)) % (60*60*1000)) / (60*1000));
			var second = parseInt((((time % (24*60*60*1000)) % (60*60*1000)) % (60*1000)) / 1000);
			if(day != 0) {
				result += day + '天';
			}
			if(hour != 0) {
				result += hour + '時';
			}
			if(minute != 0) {
				result += minute + '分';
			}
			if(second != 0) {
				result += second + '秒';
			}
		}
		if(result == '') {
			result = '0秒';
		}
		return result;
	}
}