关于字符串的两道题

js关于字符串的两道题

1.编写函数rightchange(char,n),实现字符串char 循环右移n位

  function rightchange(char,n){       var arr = char.split("");       n = n % arr.length;//取余       for(var i=1;i<=n;i++){          arr.unshift(arr.pop());       }       console.log(arr.join(""));  } rightchange("abcdefg",8);   

2 编写函数maxr(char)返回字符串char中最长的连续重复字母

 function maxr(char){        var a = 0;        var b=1;

var maxlength = 0;        var maxchar = "";

while(a<=char.length-2){            if(char.charAt(a) == char.charAt(b)){                b++;            }else{               if(b-a>maxlength){                  maxlength = b-a;                  maxchar = char.slice(a,b);               }               a = b;               b = a+1;            }        }        console.log(maxchar,maxlength);    }     var str = "mmjiiikkkmmmmmmmmllllllllllllllllllmlll"     maxr(str);