如何将字符串日期转换为以下日期格式dd-mm-yyyy作为javascript中的对象类型

var dateParts = dateString.split("-");

var dateObject = new Date(dateParts[2], dateParts[1] - 1, dateParts[0]);

var day = dateObject.getDate();
var month = dateObject.getMonth() + 1;
var year = dateObject.getFullYear();

var formattedDate = (day < 10 ? "0" + day : day) + "-" + (month < 10 ? "0" + month : month) + "-" + year;

function formatDate(dateString) {
  var dateParts = dateString.split("-");
  var dateObject = new Date(dateParts[2], dateParts[1] - 1, dateParts[0]);
  var day = dateObject.getDate();
  var month = dateObject.getMonth() + 1;
  var year = dateObject.getFullYear();
  var formattedDate = (day < 10 ? "0" + day : day) + "-" + (month < 10 ? "0" + month : month) + "-" + year;
  return formattedDate;
}

var dateString = "31-12-2022";
var formattedDate = formatDate(dateString);
console.log(formattedDate); // 输出：31-12-2022