69 lines
		
	
	
		
			2.9 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			69 lines
		
	
	
		
			2.9 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
---
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id: 587d7b7c367417b2b2512b19
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title: Modify an Object Nested Within an Object
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challengeType: 1
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videoUrl: ''
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localeTitle: 修改嵌套在对象中的对象
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---
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## Description
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<section id="description">现在让我们来看一个稍微复杂的对象。对象属性可以嵌套到任意深度,它们的值可以是JavaScript支持的任何类型的数据,包括数组甚至其他对象。考虑以下: <blockquote>让nestedObject = { <br> id:28802695164, <br>日期:'2016年12月31日', <br>数据:{ <br>总用户:99, <br>在线:80, <br> onlineStatus:{ <br>活跃:67, <br>离开:13 <br> } <br> } <br> }; </blockquote> <code>nestedObject</code>有三个唯一的键: <code>id</code> ,其值为数字, <code>date</code>为字符串的<code>data</code> , <code>data</code> ,其值为另一个嵌套在其中的对象。虽然结构很快就会变得复杂,但我们仍然可以使用相同的符号来访问我们需要的信息。 </section>
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## Instructions
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<section id="instructions">在这里,我们定义了一个对象<code>userActivity</code> ,其中包含嵌套在其中的另一个对象。您可以像修改上一个挑战中的属性一样修改此嵌套对象的属性。将<code>online</code>密钥的值设置为<code>45</code> 。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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  - text: <code>userActivity</code>具有<code>id</code> , <code>date</code>和<code>data</code>属性
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    testString: 'assert("id" in userActivity && "date" in userActivity && "data" in userActivity, "<code>userActivity</code> has <code>id</code>, <code>date</code> and <code>data</code> properties");'
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  - text: <code>userActivity</code>具有设置为具有密钥<code>totalUsers</code>和<code>online</code>的对象的<code>data</code>密钥
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    testString: 'assert("totalUsers" in userActivity.data && "online" in userActivity.data, "<code>userActivity</code> has a <code>data</code> key set to an object with keys <code>totalUsers</code> and <code>online</code>");'
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  - text: 嵌套在<code>userActivity</code> <code>data</code>键中的<code>online</code>属性应设置为<code>45</code>
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    testString: 'assert(userActivity.data.online === 45, "The <code>online</code> property nested in the <code>data</code> key of <code>userActivity</code> should be set to <code>45</code>");'
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  - text: <code>online</code>属性使用点或括号表示法设置
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    testString: 'assert.strictEqual(code.search(/online: 45/), -1, "The <code>online</code> property is set using dot or bracket notation");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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let userActivity = {
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  id: 23894201352,
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  date: 'January 1, 2017',
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  data: {
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    totalUsers: 51,
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    online: 42
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  }
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};
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// change code below this line
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// change code above this line
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console.log(userActivity);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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