Js统计字符串中出现最多的字母，数字

let str = 'asfjasiofoivnoi';

function count(str) {
  let obj = {};
  let maxNum = 0;
  let maxName;
  let arr = str.split('');
  arr.forEach(item => {
    obj[item]?obj[item]+=1:obj[item]=1
  });
  for(let key in obj){
    if(obj[key]>maxNum){
      maxNum = obj[key];
      maxName = key;
    }
  }
  console.log(`出现次数最多的是${maxName},次数是${maxNum}`);
}

count(str);