JavaScript过滤基于属性值的对象数组

Question

我在javascript中有一个对象数组.内容看起来像这样;

obj_array = [{
        "DATA_ID": 1,
        "DATA_NAME": "Dim",
        "DATA_BB_TYP": 2,
        "DATA_MAC": "5474",
    },
    {
        "DATA_ID": 3,
        "DATA_NAME": "Spre",
        "DATA_BB_TYP": 33,
        "DATA_MAC": "8e30",
    },
    {
        "DATA_ID": 2,
        "DATA_NAME": "Dimb",
        "DATA_BB_TYP": 2,
        "DATA_MAC": "45e8",
    },
    {
        "DATA_ID": 4,
        "DATA_NAME": "Kht1",
        "DATA_BB_TYP": 35,
        "DATA_MAC": "58d0",
    },
    {
        "DATA_ID": 6,
        "DATA_NAME": "Sens",
        "DATA_BB_TYP": 34,
        "DATA_MAC": "d004",
    }
]

我想保留一些对象并删除其余对象.如果object属性DATA_BB_TYP为2或34,则将保留对象.其他对象被删除.obj_array遗嘱的结果如下;

obj_array_retained = 
[{
        "DATA_ID": 1,
        "DATA_NAME": "Dim",
        "DATA_BB_TYP": 2,
        "DATA_MAC": "5474",
    },
    {
        "DATA_ID": 2,
        "DATA_NAME": "Dimb",
        "DATA_BB_TYP": 2,
        "DATA_MAC": "45e8",
    },
    {
        "DATA_ID": 6,
        "DATA_NAME": "Sens",
        "DATA_BB_TYP": 34,
        "DATA_MAC": "d004",
    }
]

我正在使用node.js v6.91.

编辑:有人建议使用过滤器来解决这类问题.使用过滤技术的答案将是最受欢迎的.

Answer 1

您可以尝试以下方法1和2:

方法1 :(使用filter)

注意:这将返回一个新数组,不会修改原始数组.

var obj_array = [{
            "DATA_ID": 1,
            "DATA_NAME": "Dim",
            "DATA_BB_TYP": 2,
            "DATA_MAC": "5474",
        },
        {
            "DATA_ID": 3,
            "DATA_NAME": "Spre",
            "DATA_BB_TYP": 33,
            "DATA_MAC": "8e30",
        },
        {
            "DATA_ID": 2,
            "DATA_NAME": "Dimb",
            "DATA_BB_TYP": 2,
            "DATA_MAC": "45e8",
        },
        {
            "DATA_ID": 4,
            "DATA_NAME": "Kht1",
            "DATA_BB_TYP": 35,
            "DATA_MAC": "58d0",
        },
        {
            "DATA_ID": 6,
            "DATA_NAME": "Sens",
            "DATA_BB_TYP": 34,
            "DATA_MAC": "d004",
        }
    ];

    var retained = [2, 34];

    var new_obj_array = obj_array.filter(function(obj) {
      if(retained.indexOf(obj.DATA_BB_TYP) === -1) {
        return false;
      }
      
      return true;
    });

    console.log(new_obj_array);

方法2 :(如果您打算在浏览器中使用此基本版本,因为filter旧浏览器不支持)

var obj_array = [{
        "DATA_ID": 1,
        "DATA_NAME": "Dim",
        "DATA_BB_TYP": 2,
        "DATA_MAC": "5474",
    },
    {
        "DATA_ID": 3,
        "DATA_NAME": "Spre",
        "DATA_BB_TYP": 33,
        "DATA_MAC": "8e30",
    },
    {
        "DATA_ID": 2,
        "DATA_NAME": "Dimb",
        "DATA_BB_TYP": 2,
        "DATA_MAC": "45e8",
    },
    {
        "DATA_ID": 4,
        "DATA_NAME": "Kht1",
        "DATA_BB_TYP": 35,
        "DATA_MAC": "58d0",
    },
    {
        "DATA_ID": 6,
        "DATA_NAME": "Sens",
        "DATA_BB_TYP": 34,
        "DATA_MAC": "d004",
    }
];

var retained = [2, 34];

for(var i = obj_array.length - 1; i >= 0; i--) {
  var obj = obj_array[i];
  if(retained.indexOf(obj.DATA_BB_TYP) === -1) {
    obj_array.splice(i, 1);
  }
}

console.log(obj_array);