仅当小数不是.00时才显示2个小数

var number = 3.14159;
var formattedNumber = number.toFixed(2);
console.log(formattedNumber); // 输出 "3.14"

number = 3.14159
formatted_number = "{:.2f}".format(number)
print(formatted_number)  # 输出 "3.14"

import java.text.DecimalFormat;

double number = 3.14159;
DecimalFormat decimalFormat = new DecimalFormat("#.00");
String formattedNumber = decimalFormat.format(number);
System.out.println(formattedNumber); // 输出 "3.14"

double number = 3.14159;
string formattedNumber = number.ToString("0.00");
Console.WriteLine(formattedNumber); // 输出 "3.14"