Question

我有一个对象，我想过滤它的键..

我试图通过ID过滤对象，如下所示：

let myKeys = Object.keys(data).filter(function(key) {
        //console.log(data[key]);
        if(parseInt(key) === parseInt(vm.system_id)) {
            return data[key];
        }
    });

    console.log(myKeys);

这部分工作 - 我正在获取密钥，但是，我没有得到此项目下的所有数据/项目即时过滤

对象即时过滤与此类似：

{
"646": [{
        "id": 52144,
        "timestamp": "2017-08-17T14:10:23Z",
        "type": "alarm",
        "code": 210,
        "title": "",
        "description": "",
        "remedy": "",
        "appeared": "2017-08-17T14:10:09Z",
        "disappeared": null,
        "acknowlegded": null,
        "solved": null,
        "system_name": "CG-MX19D7K5C1",
        "system_id": 646,
        "system_device_id": 458,
        "stream": "cu351.alarm_code"
    }
],
"693": [{
        "id": 51675,
        "timestamp": "2017-08-16T13:59:55Z",
        "type": "alarm",
        "code": 215,
        "title": "",
        "description": "",
        "remedy": "",
        "appeared": "2017-08-16T13:59:57Z",
        "disappeared": null,
        "acknowlegded": null,
        "solved": null,
        "system_name": "Demo 07122016",
        "system_id": 693,
        "system_device_id": 371,
        "stream": "cu351.alarm_code"
    }, {
        "id": 51677,
        "timestamp": "2017-08-16T13:59:57Z",
        "type": "alarm",
        "code": 214,
        "title": "",
        "description": "",
        "remedy": "",
        "appeared": "2017-08-16T13:59:59Z",
        "disappeared": null,
        "acknowlegded": null,
        "solved": null,
        "system_name": "Demo 07122016",
        "system_id": 693,
        "system_device_id": 371,
        "stream": "cu351.alarm_code"
    }
]

}

Answer 1

Array#filter期望一个布尔值作为返回值，你可以使用这个

let myKeys = Object.keys(data).filter(key => key == vm.system_id);

获取密钥，然后使用给定的密钥渲染新对象。

要获取单个数组中的所有项目，您可以使用

收集它们

let result = myKeys.reduce((r, k) => r.concat(data[k]), []);

Answer 2

如果你有正确的钥匙，你可以从对象获得财产。

myKeys.forEach(key => {
   console.log(data[key]);
});

这将打印您之前已过滤的键的对象。

按键及其项过滤对象

2 个答案: