统计数组里出现次数最多的字母

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const maxLetter = function(str) {
  const temp = {}
  const arr = str.split('')
  
  for(const item of arr) {
    if (item in temp) {
      temp[item]++
    } else {
      temp[item] = 1
    }
  }

  let max = 0
  for(const item in temp) {
    if(temp[item] > max) {
      max = temp[item]
    }
  }
  return max
}

console.log(maxLetter('alkfjdjlaaaaksjfnvcoiewoifsdksla'))

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