查找字符串中出现次数最多的字符以及次数

查找字符串中出现次数最多的字符以及次数

第一种

    <script>
        var str = 'aaabbbacc';
        var arr = [];
        for (var i = 0, length = str.length; i < length; i++) {
            var index = -1;
            var j = 0;
            do {
                index = str.indexOf(str[i], index + 1);
                if (index != -1) {
                    j++
                };
            } while (index != -1);
            arr[j] = str[i];
        }
        console.log(arr[arr.length-1]);
        console.log(arr.length-1);
    </script>

第二种

   <script>
        let str='aaabbc';
        let arr=str.split('');
        let Arr=arr.sort();
        let s=Arr.join('');
        let a='';
        let b=0;
        s.replace(/(\w)\1+/g,function(s,s2){
            if(s.length>b){
                a=s2;
                b=s.length;
            }
        });
        console.log(a,b);
    </script>

第三种

<script>
        let str = 'aabbacbbbb'; 
        let arr = str.split(''); 
        let Arr = arr.sort(); 
        let n = 1; 
        let a = 0; 
        let b = ''; 

        for (var i = 0; i < Arr.length; i++) {
            if (Arr[i] == Arr[i + 1]) {
                n++
            } else {
                if (n > a) {
                    a = n;
                    b = Arr[i]
                };
                n = 1
            }
        }
        console.log(a, b)
    </script>```