根据两个时间获取中间的时间可选项,步长为15分钟

/**
 * 获取两个时间段的所有选项,步长为15分钟
 * @param {*} startTime  开始时间 时间格式为 12:00
 * @param {*} endTime  结束时间 时间格式为 12:00
 * 返回 可选的数组
 */

function getOptions(startTime, endTime) {
  const timeMap = { '00': 0, '15': 1, '30': 2, '45': 3 }
  const numTotimeMap = ['00', '15', '30', '45']
  let [startHours, startMin] = startTime.split(':')
  let [endHours, endMin] = endTime.split(':')
  let len = endHours - startHours
  let res = []
  for (let i = 0; i < len + 1; i++) {
    let num = (i === 0 ? timeMap[startMin] : 0)
    let inlen = (i === len) ? timeMap[endMin] + 1 : 4
    for (let q = num; q < inlen; q++) {
      let hours = parseInt(startHours) + parseInt(i)
      let item = `${hours}:${numTotimeMap[q]}`
      res.push(item)
    }
  }
  return res
}

var startTime = '11:30'
var endTime = '15:00'
let res = getOptions(startTime, endTime)
console.log(res)
// [
//   '11:30', '11:45', '12:00',
//   '12:15', '12:30', '12:45',
//   '13:00', '13:15', '13:30',
//   '13:45', '14:00', '14:15',
//   '14:30', '14:45', '15:00'
// ]