js判断字符串是否有重复

   function judgeRepeated(str){
    var isRepeat = false;
    for(let v of [...str]){
      if(str.indexOf(v) !== str.lastIndexOf(v)){
        isRepeat = true;
        break;
      }
    }
    return isRepeat
  }

  judgeRepeated('asfghjklxpo阿i啊阿')?console.log(`有重复`):console.log(`无重复`)