判断一个字符串中出现次数最多的字符，统计这个次数

function findMostFrequentChar(str) {
  var charCount = {};
  var maxCount = 0;
  var mostFrequentChar = '';
  for (var i = 0; i < str.length; i++) {
    var char = str[i];
    if (charCount[char]) {
      charCount[char]++;
    } else {
      charCount[char] = 1;
    }
    if (charCount[char] > maxCount) {
      maxCount = charCount[char];
      mostFrequentChar = char;
    }
  }
  return { char: mostFrequentChar, count: maxCount };
}
var inputString = 'abcaabbcc';
var result = findMostFrequentChar(inputString);
console.log('Most frequent character:', result.char);
console.log('Count:', result.count);