如何将hms时间格式转换为ms (分:秒)格式的纯字符串

function convertHmsToMs(hmsTime) {
  var timeArray = hmsTime.split(":");
  var hours = parseInt(timeArray[0]);
  var minutes = parseInt(timeArray[1]);
  var seconds = parseInt(timeArray[2]);

  var totalMilliseconds = (hours * 3600000) + (minutes * 60000) + (seconds * 1000);

  var minutesString = Math.floor(totalMilliseconds / 60000).toString();
  var secondsString = Math.floor((totalMilliseconds % 60000) / 1000).toString();

  // 格式化为分:秒的字符串形式
  var formattedTime = minutesString + ":" + secondsString;

  return formattedTime;
}

var hmsTime = "01:23:45";
var msTime = convertHmsToMs(hmsTime);
console.log(msTime); // 输出：83:45