blocks|key|4299493|text|++++for+(name+in+users)+{
++++++console.log([name,+...users[name].skills])
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4299494|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> for (name in users) {
 console.log([name, ...users[name].skills])
 }
</code></pre>

blocks|key|4299496|text|正如注释中所说的，您应该使用括号表示法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4299497|链接：|4299498|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors|offset|length|4299499|https://javascript.info/object|4299500|此外，您还可以使用它来缩短代码：|4299501|userId.forEach(user+=>+console.log(users[user].skills));|code-block|syntax|javascript|4299502|关于数组方法，您可以在这里阅读：|4299503|https://javascript.info/array-methods|4299504|entityMap|0|LINK|mutability|MUTABLE|url|1|2^0|0|0|0|2M|0|0|0|U|1|0|0|0|0|0|11|2|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@$F|16|G|17|1|18]]|A|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@$F|1A|G|1B|1|1C]]|A|$]]|$1|J|3|K|5|6|7|1D|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1E|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1G|8|@]|9|@$F|1H|G|1I|1|1J]]|A|$]]|$1|U|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|E]]|11|$5|X|Y|Z|A|$10|I]]|12|$5|X|Y|Z|A|$10|T]]]]

As said in comments, you should use bracket notation.
Links:
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors</a>
<a href="https://javascript.info/object" rel="nofollow noreferrer">https://javascript.info/object</a>
Also, you can use this to shorten your code:
<pre><code>userId.forEach(user =&gt; console.log(users[user].skills));
</code></pre>
About array methods you can read here:
<a href="https://javascript.info/array-methods" rel="nofollow noreferrer">https://javascript.info/array-methods</a>

blocks|key|4202667|text|试试这个，它会对你有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4202668|let+userId+=+Object.keys(users);++//(3)+['Alex',+'Asab',+'Brook']
for+(let+i+=+0;+i+<+userId.length;+i%2B%2B)+{
++let+userSkills+=+users[userId[i]].skills;
}|code-block|syntax|javascript|4202669|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|$]]

Try this, It will work for you
<pre><code>let userId = Object.keys(users); //(3) ['Alex', 'Asab', 'Brook']
for (let i = 0; i &lt; userId.length; i++) {
 let userSkills = users[userId[i]].skills;
}
</code></pre>

blocks|key|4299545|text|const+users+=+{
++Alex:+{
++++email:+'alex@alex.com',
++++skills:+['HTML',+'CSS',+'JavaScript'],
++++age:+20,
++++isLoggedIn:+false,
++++points:+30
++},
++Asab:+{
++++email:+'asab@asab.com',
++++skills:+['HTML',+'CSS',+'JavaScript',+'Redux',+'MongoDB',+'Express',+'React',+'Node'],
++++age:+25,
++++isLoggedIn:+false,
++++points:+50
++},
++Brook:+{
++++email:+'daniel@daniel.com',
++++skills:+['HTML',+'CSS',+'JavaScript',+'React',+'Redux'],
++++age:+30,
++++isLoggedIn:+true,
++++points:+50
++}
}

for+(const+element+in+users)+{
++console.log(users[element].skills);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4299546|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>const users = {
 Alex: {
 email: 'alex@alex.com',
 skills: ['HTML', 'CSS', 'JavaScript'],
 age: 20,
 isLoggedIn: false,
 points: 30
 },
 Asab: {
 email: 'asab@asab.com',
 skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
 age: 25,
 isLoggedIn: false,
 points: 50
 },
 Brook: {
 email: 'daniel@daniel.com',
 skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
 age: 30,
 isLoggedIn: true,
 points: 50
 }
}

for (const element in users) {
 console.log(users[element].skills);
}
</code></pre>

blocks|key|3767732|text|您可以使用Object.entries并为其映射|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3767733|​|3767734|const+users+=+{
++Alex:+{
++++email:+'alex@alex.com',
++++skills:+['HTML',+'CSS',+'JavaScript'],
++++age:+20,
++++isLoggedIn:+false,
++++points:+30
++},
++Asab:+{
++++email:+'asab@asab.com',
++++skills:+['HTML',+'CSS',+'JavaScript',+'Redux',+'MongoDB',+'Express',+'React',+'Node'],
++++age:+25,
++++isLoggedIn:+false,
++++points:+50
++},
++Brook:+{
++++email:+'daniel@daniel.com',
++++skills:+['HTML',+'CSS',+'JavaScript',+'React',+'Redux'],
++++age:+30,
++++isLoggedIn:+true,
++++points:+50
++}
}

const+resultArray+=+Object.entries(users).map(([user,+{skills}])+=>+[user,+skills])
const+resultObject+=+Object.entries(users).map(([user,+{skills}])+=>+({user,+skills}))

console.log(resultArray)
console.log(resultObject)|code-block|syntax|javascript|3767735|3767736|entityMap^0|5|E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|T|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|O|$]]

You can use <code>Object.entries</code> and map for it
<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>const users = {
 Alex: {
 email: 'alex@alex.com',
 skills: ['HTML', 'CSS', 'JavaScript'],
 age: 20,
 isLoggedIn: false,
 points: 30
 },
 Asab: {
 email: 'asab@asab.com',
 skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
 age: 25,
 isLoggedIn: false,
 points: 50
 },
 Brook: {
 email: 'daniel@daniel.com',
 skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
 age: 30,
 isLoggedIn: true,
 points: 50
 }
}

const resultArray = Object.entries(users).map(([user, {skills}]) =&gt; [user, skills])
const resultObject = Object.entries(users).map(([user, {skills}]) =&gt; ({user, skills}))

console.log(resultArray)
console.log(resultObject)</code></pre>
</div>
</div>

blocks|key|4202700|text|let+userId+=+Object.keys(users);++//(3)+['Alex',+'Asab',+'Brook']

userId.forEach(u=>+{
++++console.log(users[u].skills);
});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4202701|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>let userId = Object.keys(users); //(3) ['Alex', 'Asab', 'Brook']

userId.forEach(u=&gt; {
 console.log(users[u].skills);
});
</code></pre>

blocks|key|4299606|text|你就快到了-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4299607|for+(let+i+=+0;+i+<+userId.length;+i%2B%2B)+{
++let+userSkills+=+users[userId[i]].skills;
++console.log(userId[i],+userSkills);
}|code-block|syntax|javascript|4299608|使用括号符号而不是点符号。因为所有的时间点符号都是不可接受的。比如-+.number，.dependingValue，.anyCalculation，numericValue.something|4299609|Javascript混合了十进制。|4299610|阅读更多：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors|offset|length|4299611|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors^0|0|0|0|0|5|2M|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

You're almost there -
<pre><code>for (let i = 0; i &lt; userId.length; i++) {
 let userSkills = users[userId[i]].skills;
 console.log(userId[i], userSkills);
}
</code></pre>
Use Bracket Notation instead of Dot Notation.
Because all the time dot notation is not acceptable. Like - .number, .dependingValue, .anyCalculation, numericValue.something
Javascript mixes up decimal.
Read more: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors</a>

In this object, I want to print out an array in the form of [userName, skills]. I know that these objects don't have indexes. Is it possible to detect the <code>skills</code> property and only print out the value of that?
<pre class="lang-js prettyprint-override"><code>const users = {
 Alex: {
 email: 'alex@alex.com',
 skills: ['HTML', 'CSS', 'JavaScript'],
 age: 20,
 isLoggedIn: false,
 points: 30
 },
 Asab: {
 email: 'asab@asab.com',
 skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
 age: 25,
 isLoggedIn: false,
 points: 50
 },
 Brook: {
 email: 'daniel@daniel.com',
 skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
 age: 30,
 isLoggedIn: true,
 points: 50
 }
}
</code></pre>
I first tried the code below but there was an error that it cannot read properties of undefined (reading 0).
<pre class="lang-js prettyprint-override"><code>let userId = Object.keys(users); //(3) ['Alex', 'Asab', 'Brook']

for (let i = 0; i &lt; userId.length; i++) {
 let userSkills = users.userId[i].skills;
 console.log(userId, userSkills);
}
</code></pre>
Is it the only way that I check all the skills one by one like below?
<pre class="lang-js prettyprint-override"><code>console.log(users.Alex.skills);
console.log(users.Asab.skills);
console.log(users.Brooks.skills);
</code></pre>

JavaScript can I directly access to a property inside a property in the 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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在这个对象中，我想以userName的形式打印一个数组。我知道这些对象没有索引。是否可以检测skills属性并只打印出该属性的值？const users = {  Alex: {    email: 'alex@alex.com',    skills: ['HTML', 'CSS', 'JavaScript'],  ...

问JavaScript可以直接访问对象中属性中的属性吗？
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问JavaScript可以直接访问对象中属性中的属性吗？
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