blocks|key|490321|text|你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|490322|​|490323|var+trial=+{+points:[{x:1,y:2},+{x:5,y:2},{x:3,y:4}]+,+obj:{id:5,name:"MyName"}};
var+path+=+["points",+0,+"x"];

var+object+=+trial;
path.map(field+=>+object+=+object[field]);

console.log(object);

path+=+["obj",+"name"];

var+object+=+trial;
path.map(field+=>+object+=+object[field]);
console.log(object);|code-block|syntax|javascript|490324|490325|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

<p>You can do like this:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var trial= { points:[{x:1,y:2}, {x:5,y:2},{x:3,y:4}] , obj:{id:5,name:"MyName"}};
var path = ["points", 0, "x"];

var object = trial;
path.map(field =&gt; object = object[field]);

console.log(object);

path = ["obj", "name"];

var object = trial;
path.map(field =&gt; object = object[field]);
console.log(object);</code></pre>
</div>
</div>
</p>


blocks|key|969991|text|您可以使用以下逻辑：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|969992|for(var+i+=+0,+result+=+trial;+i+<+path.length;+i%2B%2B)+{
++++result+=+result[path[i]];
}|code-block|syntax|javascript|969993|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>You can use the following logic:</p>

<pre><code>for(var i = 0, result = trial; i &lt; path.length; i++) {
    result = result[path[i]];
}
</code></pre>


blocks|key|2604612|text|您可以使用array#reduce并将object和path作为变量传递。Array#reduce将返回与路径对应的值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2604613|​|2604614|var+trial=+{+points:[{x:1,y:2},{x:5,y:2},{x:3,y:4}]+,+obj:{id:5,name:"MyName"}+},
++++path1+=+["points",0,"x"],
++++path2=+["obj","name"],
++++valueAtPath+=+(object,+path)+=>+path.reduce((r,p)+=>+r[p],+object);

console.log(valueAtPath(trial,+path1));
console.log(valueAtPath(trial,+path2));|code-block|syntax|javascript|2604615|2604616|entityMap^0|5|C|J|6|Q|4|11|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Z|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|O|$]]

<p>You can use <code>array#reduce</code> and pass your <code>object</code> and <code>path</code> as variables. <code>Array#reduce</code> will return the value corresponding to a path.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var trial= { points:[{x:1,y:2},{x:5,y:2},{x:3,y:4}] , obj:{id:5,name:"MyName"} },
    path1 = ["points",0,"x"],
    path2= ["obj","name"],
    valueAtPath = (object, path) =&gt; path.reduce((r,p) =&gt; r[p], object);

console.log(valueAtPath(trial, path1));
console.log(valueAtPath(trial, path2));</code></pre>
</div>
</div>
</p>


blocks|key|970173|text|披露:我是深差和json-ptr的作者。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|970174|要从属性名(如[+"points",+0,+"x"+]+)数组构建对象，请使用一个很好的JSON指针实现，因为它们中的大多数都有方便的方法来转换这些路径，并将值应用于对象图。|style|CODE|970175|例如(Node.js)：|970176|const+diff+=+require("deep-diff");
const+ptr+=+require("json-ptr");

let+original+=+{
++points:+[
++++{+x:+1,+y:+2+},
++++{+x:+5,+y:+2+},
++++{+x:+3,+y:+4+}
++],
++obj:+{
++++id:+5,
++++name:+"MyName"
++}
};

let+modified+=+JSON.parse(JSON.stringify(original));

modified.points[0].x+=+7;
modified.obj.name+=+"Wilbur+Finkle";

const+differences+=+diff(original,+modified);

//+Produce+an+object+that+represents+the+delta+between+original+and+modified+objects
const+delta+=+differences.reduce((acc,+record)+=>+{
++//+Only+process+edits+and+newly+added+values
++if+(record.kind+===+"E"+%7C%7C+record.kind+===+"N")+{
++++ptr.set(
++++++acc,+//+target
++++++ptr.encodePointer(record.path),+//+pointer;+from+path
++++++record.rhs,+//+modified+value
++++++true+//+force;+creates+object+graph
++++);
++}
++return+acc;
},+{});

console.log(JSON.stringify(delta,+null,+"++"));|code-block|syntax|javascript|970177|生产：|970178|{+points:+[+{+x:+7+}+],+obj:+{+name:+"Wilbur+Finkle"+}+}|970179|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/flitbit/diff|1|https://github.com/flitbit/json-ptr|2|https://www.rfc-editor.org/rfc/rfc6901^0|5|2|0|8|8|1|0|7|K|18|6|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]|$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|6|7|1B|8|@$A|1C|B|1D|F|G]]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|H|3|I|5|6|7|1H|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|1I|8|@]|9|@]|C|$M|N]]|$1|O|3|P|5|6|7|1J|8|@]|9|@]|C|$]]|$1|Q|3|R|5|L|7|1K|8|@]|9|@]|C|$M|N]]|$1|S|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]|12|$5|V|W|X|C|$Y|13]]]]

<p>Disclosure: I am the author of both <a href="https://github.com/flitbit/diff" rel="nofollow noreferrer">deep-diff</a> and <a href="https://github.com/flitbit/json-ptr" rel="nofollow noreferrer">json-ptr</a>.</p>
<p>To build an object out of an array of attribute names such as <code>[ &quot;points&quot;, 0, &quot;x&quot; ]</code>, use a good <a href="https://www.rfc-editor.org/rfc/rfc6901" rel="nofollow noreferrer">JSON Pointer</a> implementation, since most of them have convenience methods for translating these <em>paths</em>, and applying values to object graphs.</p>
<p>For example (Node.js):</p>
<pre class="lang-js prettyprint-override"><code>const diff = require(&quot;deep-diff&quot;);
const ptr = require(&quot;json-ptr&quot;);

let original = {
  points: [
    { x: 1, y: 2 },
    { x: 5, y: 2 },
    { x: 3, y: 4 }
  ],
  obj: {
    id: 5,
    name: &quot;MyName&quot;
  }
};

let modified = JSON.parse(JSON.stringify(original));

modified.points[0].x = 7;
modified.obj.name = &quot;Wilbur Finkle&quot;;

const differences = diff(original, modified);

// Produce an object that represents the delta between original and modified objects
const delta = differences.reduce((acc, record) =&gt; {
  // Only process edits and newly added values
  if (record.kind === &quot;E&quot; || record.kind === &quot;N&quot;) {
    ptr.set(
      acc, // target
      ptr.encodePointer(record.path), // pointer; from path
      record.rhs, // modified value
      true // force; creates object graph
    );
  }
  return acc;
}, {});

console.log(JSON.stringify(delta, null, &quot;  &quot;));
</code></pre>
<p>Produces:</p>
<pre class="lang-js prettyprint-override"><code>{ points: [ { x: 7 } ], obj: { name: &quot;Wilbur Finkle&quot; } }
</code></pre>


<p>I explain the problem with sample.</p>

<p>For example i have javascript object. It looks like: </p>

<pre><code>var trial= { points:[{x:1,y:2},{x:5,y:2},{x:3,y:4}] , obj:{id:5,name:"MyName"} }
</code></pre>

<p>I use deep diff module to find difference between two json array. Then it find the differences and find difference path. If value of x is changed, then it finds.</p>

<p>For example</p>

<pre><code>path = ["points",0,"x"] 
or
path= ["obj","name"]
</code></pre>

<p>So my question is that how to generate json object from these path. </p>

<p>For example i have to generate that</p>

<pre><code>trial.points[0].x        or    trial.obj.name  
</code></pre>

<p>How to do that ?  thank you for your answer.</p>


How to find object value from property path in Javascript object

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我用样本来解释这个问题。例如，我有javascript对象。看上去：var trial= { points:[{x:1,y:2},{x:5,y:2},{x:3,y:4}] , obj:{id:5,name:"MyName"} }我使用diff模块来查找两个json数组之间的差异。然后找出不同的地方，找到不同的路径。如果x的值被更改，那么它就会找到。例如path = ["points",0,"x"]

问如何从Javascript对象中的属性路径中找到对象值
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