要将字符串输入（如“4d 5h 8m”）转换为总分钟数，可以使用以下步骤：
使用split（）函数将输入字符串拆分为单个单词的数组。例如：

const input = "4d 5h 8m";
const words = input.split(" "); // ["4d", "5h", "8m"]

迭代单词数组并分析每个单词的值和单位。可以使用正则表达式从每个单词中提取值和单位。例如：

let totalMinutes = 0;

for (const word of words) {
     const value = parseInt(word.match(/\d+/));
     const unit = word.match(/[a-zA-Z]+/);
  if (unit === "d") {
    totalMinutes += value * 1440; // 1440 minutes in a day
  } else if (unit === "h") {
     totalMinutes += value * 60; // 60 minutes in an hour
   } else if (unit === "m") {
   totalMinutes += value;
 }
}

您可以通过三个步骤完成此操作：

• .replace()-删除金额和单位之间的空格
• .split()-按空格拆分
• .reduce()--将数量和单位减少到秒

工作代码及示例：

[
  '4days 5hours 8mins',
  '4days 5hours 8mins 20secs',
  '14 days 15 hours 18 mins',
  '4D 5 Hours 8M'
].forEach(str => {
  let time = str
    .replace(/(\d) *([a-z])[a-z]*/gi, '$1$2')  // remove space between amount and unit
    .split(/ +/)  // split on space
    .reduce((sum, val) => { // reduce amount and unit to seconds
      let m = val.match(/^([^a-z]+)(.*)/i);
      if(m) {
        let amount = Number(m[1]);
        let unit = m[2]?.toLowerCase();
        if(unit === 'd') {
          sum += amount * 60 * 60 * 24;
        } else if(unit === 'h') {
          sum += amount * 60 * 60;
        } else if(unit === 'm') {
          sum += amount * 60;
        } else if(unit === 's') {
          sum += amount;
        }
      }
      return sum;
    }, 0);
  console.log(str, ' ==> ' , time, ' seconds');
});

输出：

4days 5hours 8mins  ==>  364080  seconds
4days 5hours 8mins 20secs  ==>  364100  seconds
14 days 15 hours 18 mins  ==>  1264680  seconds
4D 5 Hours 8M  ==>  364080  seconds