javascript 按键及其项目过滤对象
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/45833702/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
filter object by key and its items
提问by hauge
I have an object that I would like to filter it's keys..
我有一个对象，我想过滤它的键..
Im trying to filter the object by an ID, like so:
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);
This works, partialy - im getting the key, however, im not getting all the data/items under this item im filtering out
这有效，部分 - 我得到了密钥，但是，我没有得到这个项目下的所有数据/项目我过滤掉了
The object im filtering is one similar to this one:
对象 im 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"
}
]
}
}
回答by Nina Scholz
Array#filteris expecting a boolean value as return value, you might use this
Array#filter期望布尔值作为返回值，您可以使用它
let myKeys = Object.keys(data).filter(key => key == vm.system_id);
for getting the keys and then render a new object with the given keys.
用于获取键，然后使用给定的键渲染一个新对象。
To get all items in a single array, you could collect them with
要获取单个数组中的所有项目，您可以使用
let result = myKeys.reduce((r, k) => r.concat(data[k]), []);
回答by Thijs
If you have the proper key(s), you can just get the property from the object.
如果您有正确的键，则可以从对象中获取属性。
myKeys.forEach(key => {
console.log(data[key]);
});
This will print the object whose keys you've filtered earlier.
这将打印您之前过滤其键的对象。
