当数字为千时，如何向输入类型数字加点

function addCommas(num) {
  return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ".");
}

var inputNumber = 1000;
var formattedNumber = addCommas(inputNumber);
console.log(formattedNumber); // 输出 "1.000"

def add_commas(num):
    return "{:,}".format(num)

input_number = 1000
formatted_number = add_commas(input_number)
print(formatted_number)  # 输出 "1,000"

import java.text.NumberFormat;
import java.util.Locale;

int inputNumber = 1000;
NumberFormat numberFormat = NumberFormat.getNumberInstance(Locale.US);
String formattedNumber = numberFormat.format(inputNumber);
System.out.println(formattedNumber); // 输出 "1,000"

int inputNumber = 1000;
string formattedNumber = inputNumber.ToString("N0");
Console.WriteLine(formattedNumber); // 输出 "1,000"

function addCommas(num) {
  var str = num.toString();
  var result = "";
  var count = 0;
  
  for (var i = str.length - 1; i >= 0; i--) {
    result = str.charAt(i) + result;
    count++;
    
    if (count % 3 === 0 && i !== 0) {
      result = "." + result;
    }
  }
  
  return result;
}

var inputNumber = 1000;
var formattedNumber = addCommas(inputNumber);
console.log(formattedNumber); // 输出 "1.000"