如何在javascript中解析和格式化不规则CSV的字符串？

function parseCSV(csvString) {
  var lines = csvString.split('\n');
  var result = [];

  for (var i = 0; i < lines.length; i++) {
    var fields = lines[i].split(',');
    var record = [];

    for (var j = 0; j < fields.length; j++) {
      var field = fields[j].trim();

      // 处理包含逗号或引号的字段
      if (field[0] === '"' && field[field.length - 1] === '"') {
        field = field.slice(1, -1);
      }

      record.push(field);
    }

    result.push(record);
  }

  return result;
}

var csvString = 'Name,Age,Email\nJohn,25,john@example.com\n"Smith, Jr.",30,smith@example.com';
var parsedData = parseCSV(csvString);
console.log(parsedData);

[
  ['Name', 'Age', 'Email'],
  ['John', '25', 'john@example.com'],
  ['Smith, Jr.', '30', 'smith@example.com']
]