freeCodeCamp/modify-an-object-nested-within-an-object.chinese.md at dfcd44eb092bb57048ce2cb6090a813d368f6434

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id, title, challengeType, videoUrl, localeTitle

id	title	challengeType	videoUrl	localeTitle
587d7b7c367417b2b2512b19	Modify an Object Nested Within an Object	1		修改嵌套在对象中的对象

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：

让nestedObject = {
id：28802695164，
日期：'2016年12月31日'，
数据：{
总用户：99，
在线：80，
onlineStatus：{
活跃：67，
离开：13
}
}
};

nestedObject有三个唯一的键： id ，其值为数字， date为字符串的data ， data ，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。

Instructions

在这里，我们定义了一个对象userActivity ，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online密钥的值设置为45 。

Tests

tests:
  - text: <code>userActivity</code>具有<code>id</code> ， <code>date</code>和<code>data</code>属性
    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");'
  - 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
    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>");'
  - 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>
    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>");'
  - text: <code>online</code>属性使用点或括号表示法设置
    testString: 'assert.strictEqual(code.search(/online: 45/), -1, "The <code>online</code> property is set using dot or bracket notation");'

Challenge Seed

let userActivity = {
  id: 23894201352,
  date: 'January 1, 2017',
  data: {
    totalUsers: 51,
    online: 42
  }
};

// change code below this line

// change code above this line

console.log(userActivity);

Solution

// solution required

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