统计传入的参数（string）中出现最多的字母，返回该字母及字母出现的次数

let countSort = string => {
    let hashTable = {}
    let arr = string.split('')

    for(let i = 0;i<arr.length;i++){
        if(!(arr[i] in hashTable)){
            if(arr[i] !== ' '){
               hashTable[arr[i]] = 1
            }
        }else{
            hashTable[arr[i]] += 1
        }
    }
  let char = ''
  let count = 0
  for(let key in hashTable){
    if(hashTable[key] > count){
      char = key
      count = hashTable[key]
    }
  }
    return char+'出现次数最多，出现'+count+'次'
}

var string = 'i amasd sdf'
console.log(countSort(string))