如何使用javascript集成字符串中字符的统计频率

function countCharacterFrequency(str) {
  var frequency = {};
  
  for (var i = 0; i < str.length; i++) {
    var char = str.charAt(i);
    
    if (frequency[char]) {
      frequency[char]++;
    } else {
      frequency[char] = 1;
    }
  }
  
  return frequency;
}

var str = "Hello, World!";
var result = countCharacterFrequency(str);
console.log(result);