从对象数组向CSV追加一行

const fs = require('fs');

// 假设我们有以下对象数组
let data = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 }
];

// 将对象数组转换为CSV格式的字符串
function convertToCSV(objArray) {
  const array = typeof objArray !== 'object' ? JSON.parse(objArray) : objArray;
  let str = '';

  for (let i = 0; i < array.length; i++) {
    let line = '';
    for (let index in array[i]) {
      if (line !== '') line += ',';
      line += array[i][index];
    }
    str += line + '\r\n';
  }

  return str;
}

// 追加数据到CSV文件
function appendToCSVFile(data, filename) {
  const csvData = convertToCSV(data);
  fs.appendFile(filename, csvData, (err) => {
    if (err) throw err;
    console.log('The data has been appended to file!');
  });
}

// 使用函数追加数据
appendToCSVFile(data, 'data.csv');