字符串中求出现最多的字符和个数

vue.js

        <template>
        </template>

        <script>
        export default {
            mounted:function(){
                this.getmaxstr();
            },
            methods:{
                getmaxstr: function(){
                    let str = 'aabbcc';
                  let newarr = []; //形式[a:1,b:2]     
                  for(let i = 0; i<str.length; i++){
                    //下标为i的字符，把它作为数组的 key值，出现一次加 1
                    if(!newarr[str.charAt(i)]){
                      newarr[str.charAt(i)] = 1;
                    } else {
                      newarr[str.charAt(i)] += 1;
                    }
                  }
                  let maxValue = 0;
                  let maxKey = ''; 
                  for(let v in newarr){
                    if(newarr[v] > maxValue){
                      maxValue = newarr[v];
                      maxKey = v;
                    }
                  }    
                  console.log(maxKey +':' + maxValue)
                  for(let v in newarr){ 
                    if(newarr[v] == maxValue  && v!==maxKey){
                      console.log(v +':' + newarr[v])
                    }
                  }
                }
            },
          data () {
            return {      
            }
          }
        }
        </script>