获取CSV文件javascript的第一列

// 读取CSV文件
function readCSVFile(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = (event) => {
      resolve(event.target.result);
    };
    reader.onerror = (event) => {
      reject(event.target.error);
    };
    reader.readAsText(file);
  });
}

// 解析CSV数据
function parseCSVData(csvData) {
  const lines = csvData.split('\n');
  const data = [];
  for (let i = 0; i < lines.length; i++) {
    const columns = lines[i].split(',');
    data.push(columns);
  }
  return data;
}

// 获取第一列数据
function getFirstColumn(csvData) {
  const firstColumn = [];
  for (let i = 0; i < csvData.length; i++) {
    firstColumn.push(csvData[i][0]);
  }
  return firstColumn;
}

// 选择CSV文件并获取第一列数据
const fileInput = document.getElementById('csvFileInput');
fileInput.addEventListener('change', async (event) => {
  const file = event.target.files[0];
  try {
    const csvData = await readCSVFile(file);
    const parsedData = parseCSVData(csvData);
    const firstColumn = getFirstColumn(parsedData);
    console.log(firstColumn);
  } catch (error) {
    console.error(error);
  }
});