blocks|key|334514|text|您正在调用关键字+clojure函数，该函数返回一个(clojure)映射的键。要返回javascript对象的所有属性，您应该这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|334515|(.keys+js/Object+myObject)|code-block|syntax|javascript|334516|这是javascript代码的类推：|334517|Object.keys(myObject);|334518|编辑:，我刚刚查看了js->clj+-+https://github.com/clojure/clojurescript/blob/master/src/main/cljs/cljs/core.cljs的源代码，我也尝试过使用画布上下文。问题是画布上下文不是标准的js/对象，因此条件(相同)？(类型x)+js/Object)不满足，js->clj函数最终出现在其他分支中，这使得js->clj作为标识函数运行，这意味着它只是在传递上下文时返回上下文。|style|BOLD|334519|这是源代码：|334520|(defprotocol+IEncodeClojure
++(-js->clj+[x+options]+"Transforms+JavaScript+values+to+Clojure"))

(defn+js->clj
++"Recursively+transforms+JavaScript+arrays+into+ClojureScript
+++vectors,+and+JavaScript+objects+into+ClojureScript+maps.++With
+++option+':keywordize-keys+true'+will+convert+object+fields+from
+++strings+to+keywords."
+([x]+(js->clj+x+{:keywordize-keys+false}))
+([x+&+opts]
+++(let+[{:keys+[keywordize-keys]}+opts
++++++keyfn+(if+keywordize-keys+keyword+str)
++++++f+(fn+thisfn+[x]
++++++++++(cond
++++++++++++(satisfies?+IEncodeClojure+x)
++++++++++++(-js->clj+x+(apply+array-map+opts))

++++++++++++(seq?+x)
++++++++++++(doall+(map+thisfn+x))

++++++++++++(coll?+x)
++++++++++++(into+(empty+x)+(map+thisfn+x))

++++++++++++(array?+x)
++++++++++++(vec+(map+thisfn+x))

++++++++++++(identical?+(type+x)+js/Object)
++++++++++++(into+{}+(for+[k+(js-keys+x)]
+++++++++++++++++++++++[(keyfn+k)+(thisfn+(aget+x+k))]))

++++++++++++:else+x))]
+++++++(f+x))))|334521|entityMap|0|LINK|mutability|MUTABLE|url|https://clojuredocs.org/clojure.core/keys|1|https://github.com/clojure/clojurescript/blob/master/src/main/cljs/cljs/core.cljs^0|5|3|0|0|0|0|0|0|3|K|29|1|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|1A|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|1B|8|@$A|1C|B|1D|O|P]]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|C|$]]|$1|S|3|T|5|F|7|1I|8|@]|9|@]|C|$G|H]]|$1|U|3|-4|5|6|7|1J|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]]]

You are calling <a href="https://clojuredocs.org/clojure.core/keys" rel="nofollow">keys</a> clojure function, which returns keys of a (clojure) map. To return all properties of javascript object you should do this :

<pre><code>(.keys js/Object myObject)
</code></pre>

which is the analogy of javascript code :

<pre><code>Object.keys(myObject);
</code></pre>

Edit :
I just looked into the source of js->clj - <a href="https://github.com/clojure/clojurescript/blob/master/src/main/cljs/cljs/core.cljs" rel="nofollow">https://github.com/clojure/clojurescript/blob/master/src/main/cljs/cljs/core.cljs</a> and I also tried it with canvas context. The problem is that the canvas context isn't a standard js/Object and therefore condition (identical? (type x) js/Object) is not satisfied and the js->clj function ends up in the else branch, which makes js->clj behave as identity function, which means that it just returns the context as you pass it in.

This is the source code :

<pre><code>(defprotocol IEncodeClojure
 (-js-&gt;clj [x options] "Transforms JavaScript values to Clojure"))

(defn js-&gt;clj
 "Recursively transforms JavaScript arrays into ClojureScript
 vectors, and JavaScript objects into ClojureScript maps. With
 option ':keywordize-keys true' will convert object fields from
 strings to keywords."
 ([x] (js-&gt;clj x {:keywordize-keys false}))
 ([x &amp; opts]
 (let [{:keys [keywordize-keys]} opts
 keyfn (if keywordize-keys keyword str)
 f (fn thisfn [x]
 (cond
 (satisfies? IEncodeClojure x)
 (-js-&gt;clj x (apply array-map opts))

 (seq? x)
 (doall (map thisfn x))

 (coll? x)
 (into (empty x) (map thisfn x))

 (array? x)
 (vec (map thisfn x))

 (identical? (type x) js/Object)
 (into {} (for [k (js-keys x)]
 [(keyfn k) (thisfn (aget x k))]))

 :else x))]
 (f x))))
</code></pre>

blocks|key|333282|text|我想出了办法。你可以直接打电话|type|unstyled|depth|inlineStyleRanges|entityRanges|data|333283|(js-keys+(.getContext+canvas+"2d"))|code-block|syntax|javascript|333284|这将列出JavaScript对象的所有函数和属性。|333285|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I figured out a way. You can just call 

<pre><code>(js-keys (.getContext canvas "2d"))
</code></pre>

and that will list all functions and properties of the JavaScript object.

Is there a simple way to list the properties and functions of a JavaScript object in ClojureScript? 

I've tried the following:

<pre><code>(keys (js-&gt;clj (.getContext canvas "2d")))
</code></pre>

But this throws the following error: 

<pre><code>ExceptionInfo #&lt;Error: [object CanvasRenderingContext2D] is not ISeqable&gt; clojure.core/ex-info (core.clj:4591)
</code></pre>

How to list the properties and functions of a JavaScript object in ClojureScript?

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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是否有一种简单的方法可以在JavaScript中列出ClojureScript对象的属性和函数？我试过以下几种方法：(keys (js->clj (.getContext canvas "2d")))但这会引发以下错误：ExceptionInfo #<Error: [object CanvasRenderingCont...

问如何在JavaScript中列出ClojureScript对象的属性和函数？
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