js 两个数组进行去重处理，返回去重后的数组

array_diff(a, b) {
      for (var i = 0; i < b.length; i++) {
        for (var j = 0; j < a.length; j++) {
          if (a[j].id == b[i].id) {
            a.splice(j, 1);
            j = j - 1;
          }
        }
      }
      return a;
    }

function array_diff(a, b) {
    for (var i = 0; i < b.length; i++) {
      for (var j = 0; j < a.length; j++) {
        if (a[j].id == b[i].id) {
          a.splice(j, 1);
          j = j - 1;
        }
      }
    }
    return a;
  }

  var arr1=[
      {name:"父节点1",id:1},
      {name:"父节点2",id:2},
      {name:"父节点3",id:3},
      {name:"父节点4",id:4},
  ];

  var arr2=[
    {name:"父节点1",id:1},
    {name:"父节点2",id:2},
]
array_diff(arr1, arr2)
返回的数据为：

[
  {name:"父节点3",id:3},
  {name:"父节点4",id:4}
]