js在对象中找出重复数据

var arr  = '1,2,3,4,6,3,1,1,5,6,3,3,6,8,9,53,2'
arr = arr.split(',').sort();
var newArr = []; // 
for (var i = 0; i < arr.length;) {
  var count = 0;
  for (var j = i; j < arr.length; j++) {
    if (arr[i] == arr[j]) {
      count++;
    }
  }
  newArr.push({
    'number': arr[i],
    'count':count
  });
  i += count
}
//遍历出重复数据
var repeat = []
for(var i = 0; i < newArr.length; i++){
  if(newArr[i].count > 1){
  	repeat.push(newArr[i])
  }
}
console.log('repeat',repeat)