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。如果对象属性DATA_BB_TYP为2或34，则将保留对象。其他对象被删除。 obj_array的结果将如下所示;

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override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. Timer.scheduledTimer(timeInterval: 7.0, target: self, selector: #selector(functionOne), userInfo: nil, repeats: true) } func functionOne () { print("hello") }）

注意：这将返回一个新数组，不会修改原始数组。

{
  "compilerOptions": {
    "module": "commonjs",
    "moduleResolution": "node",
    ...

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

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);

JavaScript过滤基于属性值的对象数组

1 个答案: