根据javascript中对象中值的出现频率列出对象的键

function findMostFrequentKeys(obj) {
  var frequency = {};
  var maxFrequency = 0;
  var mostFrequentKeys = [];

  for (var key in obj) {
    var value = obj[key];

    if (frequency[value]) {
      frequency[value]++;
    } else {
      frequency[value] = 1;
    }
  }

  for (var key in frequency) {
    if (frequency[key] > maxFrequency) {
      maxFrequency = frequency[key];
    }
  }

  for (var key in frequency) {
    if (frequency[key] === maxFrequency) {
      mostFrequentKeys.push(key);
    }
  }

  return mostFrequentKeys;
}

// 示例用法
var obj = { a: 1, b: 2, c: 2, d: 3, e: 3, f: 3 };
var result = findMostFrequentKeys(obj);
console.log(result); // 输出: ["c", "d", "e", "f"]