字符串中出现次数最多的字符和次数

var str = 'aaaaabbbbcccdde';
var obj = {};
for(var i of str){
   if(obj.hasOwnProperty(i)){
       obj[i]++;
   }else{
       obj[i]=1;
   }
   
}
var max = 0;
var char = '';
for( item in obj){
   if(obj[item]>max){
       max = obj[item];
       char = item;
   }
}
console.log(max,char);