问如何在javascript中获取从今天到指定日期的天数？

EN

function days_between(date1, date2) {

    // The number of milliseconds in one day
    var ONE_DAY = 1000 * 60 * 60 * 24

    // Convert both dates to milliseconds
    var date1_ms = date1.getTime()
    var date2_ms = date2.getTime()

    // Calculate the difference in milliseconds
    var difference_ms = Math.abs(date1_ms - date2_ms)

    // Convert back to days and return
    return Math.round(difference_ms/ONE_DAY)

}

Math.abs(new Date() - Date.parse("Nov 9, 2010")) / ( 60*60*24) / 1000

24.786491909722223

function startOfDay(d) {
  d.setHours(0); d.setMinutes(0); d.setSeconds(0); d.setMilliseconds(0);
  return d;
}

var startOfToday = startOfDay(new Date());