JavaScript基于对象方法实现数组去重及排序操作示

<script>
  //用对象方法实现数组去重
  Array.prototype.unique = function() {
    var newArr = [];
    for (var i = 0; i < this.length; i++) {
      if(newArr.indexOf(this[i]) == -1){
        newArr.push(this[i]);
      }
    }
    return newArr;
  };
  var jarr = [1,2,4,3,45,6,33,4,2];
  var unq = jarr.unique();
  console.log(unq);
  //对结果排序 sort
  unq.sort(function pare(a,b){
    return a-b; //倒序 b-a
  });
  console.log(unq);
</script>