如何将字符串添加到.txt文件的末尾？

with open("file.txt", "a") as file:
    file.write("字符串")

import java.io.FileWriter;
import java.io.IOException;
import java.io.BufferedWriter;

public class Main {
    public static void main(String[] args) {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter("file.txt", true));
            writer.write("字符串");
            writer.newLine();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

#include<iostream>
#include <fstream>

int main() {
    std::ofstream file("file.txt", std::ios_base::app);
    file << "字符串"<< std::endl;
    file.close();
    return 0;
}

const fs = require('fs');

fs.appendFile('file.txt', '字符串\n', (err) => {
    if (err) throw err;
    console.log('字符串已成功添加到文件末尾');
});