blocks|key|2860406|text|您必须创建自定义管道。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2860407|import+{+Injectable,+Pipe+}+from+'@angular/core';
@Pipe({
+++name:+'keyobject'
})
@Injectable()
export+class+Keyobject+{

transform(value,+args:string[]):any+{
++++let+keys+=+[];
++++for+(let+key+in+value)+{
++++++++keys.push({key:+key,+value:+value[key]});
++++}
++++return+keys;
}}|code-block|syntax|javascript|2860408|然后在你的*ngFor中使用它|2860409|*ngFor="let+item+of+data+%7C+keyobject"|2860410|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You have to create custom pipe.

<pre><code>import { Injectable, Pipe } from '@angular/core';
@Pipe({
 name: 'keyobject'
})
@Injectable()
export class Keyobject {

transform(value, args:string[]):any {
 let keys = [];
 for (let key in value) {
 keys.push({key: key, value: value[key]});
 }
 return keys;
}}
</code></pre>

And then use it in your *ngFor

<pre><code>*ngFor="let item of data | keyobject"
</code></pre>

blocks|key|107054|text|Angular+6.0.0|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|107055|https://github.com/angular/angular/blob/master/CHANGELOG.md#610-2018-07-25|107056|介绍了一个KeyValuePipe|CODE|107057|另请参阅https://angular.io/api/common/KeyValuePipe|107058|107059|+@Component({选择器：‘键值-管道’，模板：+++++Object+++++<div+\*ngFor="let+item+of+object+%7C+keyvalue">+++++++{{item.key}}:{{item.value}}+++++</div>+++++Map+++++<div+\*ngFor="let+item+of+map+%7C+keyvalue">+++++++{{item.key}}:{{item.value}}+++++</div>++++})导出类KeyValuePipeComponent+{+object：{key:+number:+string}+=+{2：'foo'，1：'bar'}；map+=+new+Map([2，'foo'，1，'bar'])；}|blockquote|107060|107061|107062|原始|107063|你可以使用管道|107064|@Pipe({+name:+'keys',++pure:+false+})
export+class+KeysPipe+implements+PipeTransform+{
++++transform(value:+any,+args:+any[]+=+null):+any+{
++++++++return+Object.keys(value)//.map(key+=>+value[key]);
++++}
}|code-block|syntax|javascript|107065|<div+*ngFor="let+key+of+objs+%7C+keys">|107066|另请参阅How+to+iterate+object+keys+using+*ngFor?|107067|entityMap|0|LINK|mutability|MUTABLE|url|1|https://angular.io/api/common/KeyValuePipe|2|https://stackoverflow.com/questions/37046138/how-to-use-ngfor-with-object/37046743#37046743^0|0|D|0|0|22|0|0|5|C|0|4|16|1|0|0|S|6K|0|0|0|0|2|0|0|0|0|4|14|2|0^^$0|@$1|2|3|4|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|H|3|I|5|6|7|1N|8|@$9|1O|A|1P|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|1Q|8|@]|D|@$9|1R|A|1S|1|1T]]|E|$]]|$1|M|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1V|8|@$9|1W|A|1X|B|J]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|20|8|@$9|21|A|22|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|23|8|@]|D|@]|E|$]]|$1|W|3|X|5|Y|7|24|8|@]|D|@]|E|$Z|10]]|$1|11|3|12|5|Y|7|25|8|@]|D|@]|E|$Z|10]]|$1|13|3|14|5|6|7|26|8|@]|D|@$9|27|A|28|1|29]]|E|$]]|$1|15|3|-4|5|6|7|2A|8|@]|D|@]|E|$]]]|16|$17|$5|18|19|1A|E|$1B|G]]|1C|$5|18|19|1A|E|$1B|1D]]|1E|$5|18|19|1A|E|$1B|1F]]]]

Angular 6.0.0

<a href="https://github.com/angular/angular/blob/master/CHANGELOG.md#610-2018-07-25" rel="noreferrer">https://github.com/angular/angular/blob/master/CHANGELOG.md#610-2018-07-25</a>

introduced a <code>KeyValuePipe</code>

See also <a href="https://angular.io/api/common/KeyValuePipe" rel="noreferrer">https://angular.io/api/common/KeyValuePipe</a>

<blockquote>
<pre class="lang-ts prettyprint-override"><code>@Component({
 selector: 'keyvalue-pipe',
 template: `&lt;span&gt;
 &lt;p&gt;Object&lt;/p&gt;
 &lt;div *ngFor="let item of object | keyvalue"&gt;
 {{item.key}}:{{item.value}}
 &lt;/div&gt;
 &lt;p&gt;Map&lt;/p&gt;
 &lt;div *ngFor="let item of map | keyvalue"&gt;
 {{item.key}}:{{item.value}}
 &lt;/div&gt;
 &lt;/span&gt;`
})
export class KeyValuePipeComponent {
 object: {[key: number]: string} = {2: 'foo', 1: 'bar'};
 map = new Map([[2, 'foo'], [1, 'bar']]);
}
</code></pre>
</blockquote>

original

You can use a pipe

<pre class="lang-ts prettyprint-override"><code>@Pipe({ name: 'keys', pure: false })
export class KeysPipe implements PipeTransform {
 transform(value: any, args: any[] = null): any {
 return Object.keys(value)//.map(key =&gt; value[key]);
 }
}
</code></pre>



<pre class="lang-ts prettyprint-override"><code>&lt;div *ngFor="let key of objs | keys"&gt;
</code></pre>

See also <a href="https://stackoverflow.com/questions/37046138/how-to-use-ngfor-with-object/37046743#37046743">How to iterate object keys using *ngFor?</a>

blocks|key|106943|text|如果您在响应上使用map()运算符，您可以将toArray()运算符链接到it...then。您应该能够迭代新创建的array...at，这对我来说至少是有效的:)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|106944|entityMap^0|9|5|M|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

If you are using a <code>map()</code> operator on your response,you could maybe chain a <code>toArray()</code> operator to it...then you should be able to iterate through newly created array...at least that worked for me :)

blocks|key|109496|text|我会这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109497|<li+*ngFor="let+item+of+data"+(click)='onclick(item)'>{{item.picture.url}}</li>|code-block|syntax|javascript|109498|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|$]]

i would do this:

<pre><code>&lt;li *ngFor="let item of data" (click)='onclick(item)'&gt;{{item.picture.url}}&lt;/li&gt;
</code></pre>

blocks|key|107092|text|我认为最优雅的方式是像这样使用javascript+Object.keys+(我最初实现了一个管道，但对我来说，它只是使我的工作变得复杂，不必要的)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|107093|在组件中，将对象传递给模板：|107094|Object+=+Object;|code-block|syntax|javascript|107095|然后在模板中：|107096|<div+*ngFor="let+key+of+Object.keys(objs)">
+++my+key:+{{key}}
+++my+object+{{objs[key]+%7C+json}}+
</div>|107097|如果你有很多的子对象，你应该创建一个组件来为你打印对象。通过打印你想要的值和键，并且在一个子对象上递归地调用它自己。|107098|Hier你可以找到这两种方法的stackblitz演示。|107099|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/keys|1|https://stackblitz.com/edit/angular-6sxa2x^0|Q|B|Q|B|0|0|0|0|0|0|0|0|4|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1C|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1E|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|U|3|-4|5|6|7|1J|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]]]

I think the most elegant way to do that is to use the javascript <a href="https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/keys" rel="noreferrer"><code>Object.keys</code></a> like this (I had first implemented a pipe for that but for me, it just complicated my work unnecessary):

in the Component pass Object to template:

<pre><code>Object = Object;
</code></pre>

then in the template:

<pre><code>&lt;div *ngFor="let key of Object.keys(objs)"&gt;
 my key: {{key}}
 my object {{objs[key] | json}} &lt;!-- hier I could use ngFor again with Object.keys(objs[key]) --&gt;
&lt;/div&gt;
</code></pre>

If you have a lot of subobjects you should create a component that will print the object for you. By printing the values and keys as you want and on an subobject calling itselfe recursively.

<a href="https://stackblitz.com/edit/angular-6sxa2x" rel="noreferrer">Hier</a> you can find an stackblitz demo for both methods.

blocks|key|109223|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109224|+1.创建自定义管道以获取密钥。|blockquote|109225|109226|109227|import+{+Pipe,+PipeTransform+}+from+'@angular/core';

@Pipe({
++name:+'keys'
})
export+class+KeysPipe+implements+PipeTransform+{

++transform(value:+any,+args?:+any):+any+{
++++return+Object.keys(value);
++}
}|code-block|syntax|javascript|109228|109229|109230|109231|在angular模板文件中，您可以使用*In对您的object+|109232|unordered-list-item|109233|
进行迭代|109234|<div+class+="test"+*ngFor="let+key+of+Obj+%7C+keys">
++++{{key}}
++++{{Obj[key].property}
<div>|109235|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|X|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|Y|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|Z|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|10|7|@]|8|@]|9|$]]|$1|F|3|G|4|H|6|11|7|@]|8|@]|9|$I|J]]|$1|K|3|-4|4|5|6|12|7|@]|8|@]|9|$]]|$1|L|3|-4|4|C|6|13|7|@]|8|@]|9|$]]|$1|M|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|N|3|O|4|5|6|15|7|@]|8|@]|9|$]]|$1|P|3|-4|4|Q|6|16|7|@]|8|@]|9|$]]|$1|R|3|S|4|5|6|17|7|@]|8|@]|9|$]]|$1|T|3|U|4|H|6|18|7|@]|8|@]|9|$I|J]]|$1|V|3|-4|4|5|6|19|7|@]|8|@]|9|$]]]|W|$]]

<blockquote>
 1.Create a custom pipe to get keys.
</blockquote>

<pre><code>import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
 name: 'keys'
})
export class KeysPipe implements PipeTransform {

 transform(value: any, args?: any): any {
 return Object.keys(value);
 }
}
</code></pre>

<blockquote>
 <ol start="2">
 <li>In angular template file, you can use *ngFor and iterate over your object object</li>
 </ol>
</blockquote>

<pre><code>&lt;div class ="test" *ngFor="let key of Obj | keys"&gt;
 {{key}}
 {{Obj[key].property}
&lt;div&gt;
</code></pre>

blocks|key|109247|text|我知道这个问题已经回答了，但我有一个相同的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109248|您也可以在*ngFor内部使用Object.keys()来获得所需的结果。|offset|length|style|CODE|109249|我已经在上创建了一个演示。我希望这对你/其他人有帮助/指导。|109250|代码片段|BOLD|109251|109252|+HTML代码|blockquote|109253|109254|109255|<div+*ngFor="let+key+of+Object.keys(myObj)">
++Key->+{{key}}+and+value+is+->+{{myObj[key]}}
</div>|code-block|syntax|javascript|109256|109257|+.ts文件代码|109258|109259|109260|Object+=+Object;

myObj+=+{
++++"id":+834,
++++"first_name":+"GS",
++++"last_name":+"Shahid",
++++"phone":+"1234567890",
++++"role":+null,
++++"email":+"test@example.com",
++++"picture":+{
++++++++"url":+null,
++++++++"thumb":+{
++++++++++++"url":+null
++++++++}
++++},
++++"address":+"XYZ+Colony",
++++"city_id":+2,
++++"provider":+"email",
++++"uid":+"test@example.com"
}|109261|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys^0|0|5|6|F|D|F|D|0|0|0|0|4|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@$D|1E|E|1F|F|G]|$D|1G|E|1H|F|G]]|9|@$D|1I|E|1J|1|1K]]|A|$]]|$1|H|3|I|5|6|7|1L|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1M|8|@$D|1N|E|1O|F|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1Q|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|1T|8|@]|9|@]|A|$V|W]]|$1|X|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|P|7|1V|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|12|3|13|5|U|7|1Y|8|@]|9|@]|A|$V|W]]|$1|14|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]]]

I know this question is already answered but I have one solution for this same. 

You can also use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys" rel="noreferrer"><code>Object.keys()</code></a> inside of <code>*ngFor</code> to get required result.

I have created a demo on <a href="https://stackblitz.com/edit/how-to-iterate-object-keys-using-ngfor?file=app%2Fapp.component.html" rel="noreferrer">stackblitz</a>. I hope this will help/guide to you/others.

CODE SNIPPET

<blockquote>
 HTML Code
</blockquote>

<pre><code>&lt;div *ngFor="let key of Object.keys(myObj)"&gt;
 &lt;p&gt;Key-&gt; {{key}} and value is -&gt; {{myObj[key]}}&lt;/p&gt;
&lt;/div&gt;
</code></pre>

<blockquote>
 .ts file code
</blockquote>

<pre><code>Object = Object;

myObj = {
 "id": 834,
 "first_name": "GS",
 "last_name": "Shahid",
 "phone": "1234567890",
 "role": null,
 "email": "test@example.com",
 "picture": {
 "url": null,
 "thumb": {
 "url": null
 }
 },
 "address": "XYZ Colony",
 "city_id": 2,
 "provider": "email",
 "uid": "test@example.com"
}
</code></pre>

blocks|key|106995|text|Angular现在有一种针对此场景的iterate对象，称为Set。当我发现这个问题正在搜索时，它符合我的需求。您可以创建集合，像“推”到数组一样“添加”它，然后像数组一样将它放入ngFor中。没有管子之类的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|106996|this.myObjList+=+new+Set();|code-block|syntax|javascript|106997|..。|106998|this.myObjList.add(obj);|106999|107000|<ul>
+++<li+*ngFor="let+object+of+myObjList">
+++++{{object}}
+++</li>
</ul>|107001|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|K|3|H|5|6|7|T|8|@]|9|@]|A|$]]|$1|L|3|M|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|N|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|O|$]]

Angular now has a type of iterate Object for exactly this scenario, called a Set. It fit my needs when I found this question searching. You create the set, "add" to it like you'd "push" to an array, and drop it in an ngFor just like an array. No pipes or anything.

<pre><code>this.myObjList = new Set();
</code></pre>

...

<pre><code>this.myObjList.add(obj);
</code></pre>

...

<pre><code>&lt;ul&gt;
 &lt;li *ngFor="let object of myObjList"&gt;
 {{object}}
 &lt;/li&gt;
&lt;/ul&gt;
</code></pre>

blocks|key|109291|text|在对模板中的嵌套循环进行了大量的故障排除之后，我发现这更适合我的使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109292|(首先，我试图迭代agm-polygon，但它不允许我嵌套div)。|109293|在component.ts中：|109294|Object+=+Object

values=+Object.values(this.arrayOfObjects)|code-block|syntax|javascript|109295|在component.html中：|109296|<div+*ngFor='let+value+of+values'>{{value.property}}</div>|109297|一旦检索到值，您就拥有了Iterable，并且不需要担心还要迭代模板中的键，这可能会变得复杂和混乱。|109298|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

After doing a lot of troubleshooting nested loops in the template, I found that this worked better for my use:
(For one thing I was trying to iterate agm-polygon and it wouldn't let me nest divs).
In component.ts:
<pre><code>Object = Object

values= Object.values(this.arrayOfObjects)
</code></pre>
In component.html:
<pre><code>&lt;div *ngFor='let value of values'&gt;{{value.property}}&lt;/div&gt;
</code></pre>
Once you retrieve the values, you do have an Iterable, and do not need to worry about also iterating through the keys in the template, which can get complex and look messy.

blocks|key|2860737|text|在Angular+HTML模板中循环遍历对象|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2860738|在Angular中引入了keyValuePipe+:请参考https://angular.io/api/common/KeyValuePipe|offset|length|2860739|快速代码：|2860740|Object
++++<div+*ngFor="let+item+of+object+%7C+keyvalue">
++++++{{item.key}}:{{item.value}}
++++</div>
++++Map
++++<div+*ngFor="let+item+of+map+%7C+keyvalue">
++++++{{item.key}}:{{item.value}}
++++</div>|code-block|syntax|javascript|2860741|entityMap|0|LINK|mutability|MUTABLE|url|https://angular.io/api/common/KeyValuePipe^0|0|T|16|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Looping through object in Angular HTML templates
keyValuePipe is introduced in Angular: Please refer <a href="https://angular.io/api/common/KeyValuePipe" rel="nofollow noreferrer">https://angular.io/api/common/KeyValuePipe</a>
Quick code:
<pre class="lang-js prettyprint-override"><code>&lt;p&gt;Object&lt;/p&gt;
 &lt;div *ngFor=&quot;let item of object | keyvalue&quot;&gt;
 {{item.key}}:{{item.value}}
 &lt;/div&gt;
 &lt;p&gt;Map&lt;/p&gt;
 &lt;div *ngFor=&quot;let item of map | keyvalue&quot;&gt;
 {{item.key}}:{{item.value}}
 &lt;/div&gt;
</code></pre>

I want to iterate [object object] using *ngFor in Angular 2. The problem is the object is not array of object but object of object which contains further objects.

<pre><code>{

 "data": {
 "id": 834,
 "first_name": "GS",
 "last_name": "Shahid",
 "phone": "03215110224",
 "role": null,
 "email": "test@example.com",
 "picture": **{ &lt;-- I want to get thumb: url but not able to fetch that**
 "url": null,
 "thumb": {
 "url": null
 }
 },
 "address": "Nishtar Colony",
 "city_id": 2,
 "provider": "email",
 "uid": "test@example.com"
 }
}
</code></pre>

I know we can use pipe to iterate the object but how we can iterate further from object to object means data->picture->thum:url.

How to iterate object keys using *ngFor

我想在Angular 2中使用*ngFor迭代object对象。问题是对象不是对象的数组，而是包含更多对象的对象的对象。{  "data": {    "id": 834,    "first_name": "GS",    "last_name": "Shahid",    "phone": "03215110224...

问如何使用*ngFor迭代对象键
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