如何将字符串转换为yyyymmdd格式的日期

function convertToYYYYMMDD(dateString) {
  var parts = dateString.split("-");
  var year = parseInt(parts[0]);
  var month = parseInt(parts[1]);
  var day = parseInt(parts[2]);
  
  var date = new Date(year, month - 1, day);
  
  var formattedDate = date.getFullYear() + "" + (date.getMonth() + 1).toString().padStart(2, '0') + "" + date.getDate().toString().padStart(2, '0');
  
  return formattedDate;
}

var inputString = "2022-05-15";
var formattedDateString = convertToYYYYMMDD(inputString);
console.log(formattedDateString); // 输出：20220515