控制台日志并从多个switch语句添加值

Question

我正在尝试从switch语句（<ol class="lower-alpha" start="2"> <li>Explain...</li> <li>Describe...</li> <li value="5">Calculate...</li> </ol>，value，breakMonValue）中添加多个值，以便我可以finishMonValue将这些值添加在一起，并希望知道这是否可能吗？

未定义startMonTimeStr变量

console.log

它们的布局如下：

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance"); }

function _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

var timeStringToValue = function timeStringToValue(timeStr) {
  var _timeStr$match = timeStr.match(/(\d+):(\d+) ([ap]m)/),
      _timeStr$match2 = _slicedToArray(_timeStr$match, 4),
      hours = _timeStr$match2[1],
      minutes = _timeStr$match2[2],
      ampm = _timeStr$match2[3];

  var ampmHourModifier = ampm === 'pm' ? 12 : 0;
  return Number(hours) + ampmHourModifier + minutes / 60;


};

var startMonTimeStr = $('.start-time-monday option:selected').text();
var startMonValue = timeStringToValue(startMonTimeStr);


console.log(timeStringToValue(StartMonValue));
console.log(timeStringToValue('3:30 pm'));

Answer 1

使用数学将时间字符串解析为数字可能会更优雅，例如：

const timeStringToValue = (timeStr) => {
  const [, hours, minutes, ampm] = timeStr.match(/(\d+):(\d+) ([ap]m)/);
  const ampmHourModifier = ampm === 'pm' ? 12 : 0;
  return Number(hours) + ampmHourModifier + (minutes / 60)
};

console.log(timeStringToValue('10:00 am'));
console.log(timeStringToValue('3:30 pm'));

然后您可以调用它：

const startMonTimeStr = $('.start-time-monday option:selected').text();
const startMonValue = timeStringToValue(startMonTimeStr);

和

const finishMonTimeStr = $('.finish-time-monday option:selected').text();
const finishMonValue = timeStringToValue(finishMonTimeStr);

switch在大多数情况下都是不必要的冗长和丑陋，这也不例外。

如果您想将所有总数相加，请进行更改以计算每个小计，例如：

const getBreakTotal = () => {
  const minutes = $('.meal-break-monday option:selected').text().match(/^\d+/)[0];
  return minutes / 60;
};
const getAllTotals = () => {
  const startTotal = timeStringToValue($('.start-time-monday option:selected').text());
  const breakTotal = getBreakTotal();
  const finishTotal = timeStringToValue($('.finish-time-monday option:selected').text());
  console.log(startTotal + breakTotal + finishTotal);
};

$('.start-time-monday, .meal-break-monday, .finish-time-monday').on('change', getAllTotals);