如何格式化表示为字符串的数字？

const number = 12345.6789;
const formattedNumber = number.toLocaleString('en-US', { style: 'currency', currency: 'USD' });
console.log(formattedNumber); // 输出：$12,345.68

number = 12345.6789
formattedNumber = '{:,.2f}'.format(number)
print(formattedNumber)  # 输出：12,345.68

import java.text.DecimalFormat;

double number = 0.12345;
DecimalFormat decimalFormat = new DecimalFormat("0.00%");
String formattedNumber = decimalFormat.format(number);
System.out.println(formattedNumber); // 输出：12.35%

double number = 12345.6789;
string formattedNumber = number.ToString("0.00E+00");
Console.WriteLine(formattedNumber); // 输出：1.23E+04