如何获得深层嵌套对象的某些价值? [英] How can I get some value of a deep-nested object?

问题描述

我必须动态构建两种类型的数组.

There are two types of arrays which I have to build dynamically.

data['fields']['title']

和

data['fields']['description']['html']

它返回此结构的内容:

{   
    "fields": {
        "title": "Headline",
        "description": {
            "html": "<p>description text</p>"
        }   
    },   
    "meta": {
        "id": "995915463198380032"   
    } 
}

问题是动态"的.

我调用一个函数，并像"description>html"那样给出通过它的路径. 我将字符串分为描述"和"html". 但是，现在我该如何构建数组:data['fields']['description']['html']

I call a function and give the path through it like "description>html". I split the string into "description" and "html". But how do I build now the array: data['fields']['description']['html']

有时候，有些级别或多或少像标题". 如果我想称呼标题，数组就像data['fields']['title']

Sometimes there is a level more or less like "title". If I want to call title, the array is like data['fields']['title']

所以数组的内容和数量是动态的.

So the content and the number of parts in the array are dynamic.

我自己尝试过这个:

function comfort_x(item_fields) {


var splitter = item_fields.split(">");
var content = new Array();

for (var i = 1; i < splitter.length; ++i) {
    content['splitter['+i+']'] = splitter[i];
}

data['fields'][splitter[0]][splitter[1]];

}

谢谢您的帮助.

推荐答案

您可以创建一个函数来查找要传递的级别.您可以通过>只是split路径，并使用源输入来缩小该数组.

You can create a function that will look up to the level you are passing. You can just split your path by > and reduce that array with the source input.

(data, path) => path.split(">").reduce((r, e) => r[e], data);

这里是一个例子.

var obj = {   
    "fields": {
        "title": "Headline",
        "description": {
            "html": "<p>description text</p>"
        }   
    },   
    "meta": {
        "id": "995915463198380032"   
    } 
}

var lookUp = (o, path) => path.split(">").reduce((r, e) => r[e], o);

console.log('fields: ', lookUp(obj, 'fields'))
console.log('fields>title: ', lookUp(obj, 'fields>title'))
console.log('fields>description>html: ', lookUp(obj, 'fields>description>html'))

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