Question

我现在想不到......我一直试图弄清楚两个变量之间有多少半小时，这将有如此的开始和结束时间，1100和1430

我开始做以下事情，但意识到时间不到100！

function process_blocks(startTime,endTime){

var blocks = 0;

startTime = +startTime;
endTime = +endTime;

while(startTime < endTime){
startTime = startTime + 30; // add a half hour, which is a block
blocks++;
}
return blocks;

}

Answer 1

你需要对待成千上万的人。数百小时，数十小时和数十小时那些数字是分钟。

24小时总是有4位数，所以取前两个，并比较：

$first = 11;
$second = 14;

$diff = $second - $first; //number of full hours

$fmin = 00;
$smin = 30;

$sdiff = $smin - $fmin; // number of minutes difference
//Do magic to determine how many half hours this is, probably using division and modulo
$halfs = magic($sdiff);

$halfhours = (2 * $diff) + $halfs;

Answer 2

在分钟中计算区间，然后除以30：

/**
 * @param startTime integer hours and minutes as an integer like 1100 or 1430
 * @param endTime integer hours and minutes as an integer like 1100 or 1430
 * endTime must be equal to or higher than startTime, else you'll get a negative
 * number of half hours :D
 */
function half_hours_in_interval(startTime, endTime) {
    var hours, minutes, total_minutes;

    hours = Math.floor(endTime / 100) - Math.floor(startTime / 100);
    minutes = (endTime % 100) - (startTime % 100);

    if (minutes < 0) { // this step is probably not even necessary, but just for sanity's sake
        hours -= 1;
        minutes += 60;
    }

    total_minutes = hours * 60 + minutes; // now we know how many minutes are in the interval
    return Math.floor(total_minutes / 30); // or ceil or round or whatever you want
}

另外，不要将函数命名为'process_X'，因为它没有真正描述函数。

Answer 3

将所有内容转换为分钟数，然后将结果除以30（如果需要，可以将其舍入）

var start = Math.floor(startTime/100)*60 + (startTime%100);
var end = Math.floor(endTime/100)*60 + (endTime%100);
return (end-start)/30;

Answer 4

其他答案有效，但如果您试图找到不同日期之间发生的30分钟数量的块，则会遇到问题。如果将startTime和endTime转换为Date对象并比较每个对象之间的30分钟块数，则会更好。

以下内容接受两个日期并返回两个日期之间的完整30分钟块数。在这个例子中，我添加了一个随机的654分钟，但你可以修改你喜欢的：

var now = new Date();
var later = new Date(now);
later.setMinutes(now.getMinutes() + 654);

function process_blocks(startTime,endTime) {
    if (endTime < startTime) {
        alert('endTime must be greater than startTime');
    }
    else {
        alert('There are ' + Math.round((endTime - startTime)/1000/60/30) + ' full 30 minute blocks between the two times' );
    }
}

process_blocks(now,later);

Answer 5

function getHalfHourCount(start, end) {
    start = getMinutes(start);
    end = getMinutes(end);
    var diff;
    if (end < start)
        diff = 24*60 - start + end
    else 
        diff = end - start;

    if (start % 30 != 0)
        diff = diff + start % 30;

    --diff;

    var result = Math.floor(diff / 30);

    document.write(result + "<br />");
    return result;
}

function getMinutes(time) {
    time = String(time);
    if (time.length == 4)
        return parseInt(time.substr(0, 2)) * 60 + parseInt(time.substr(2, 2));
    else
        return parseInt(time.substr(0, 1)) * 60 + parseInt(time.substr(1, 2));
}

查看我的工作演示：http://jsfiddle.net/roberkules/pUfF2/

试图在两次之间找到半小时的数量

5 个答案: