freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/updating-object-properties.md

---
id: 56bbb991ad1ed5201cd392d1
challengeType: 1
videoUrl: 'https://scrimba.com/c/c9yEJT4'
forumTopicId: 18336
title: 更新对象属性
---

## Description
<section id='description'>
当你创建了一个对象后，你可以用点操作符或中括号操作符来更新对象的属性。
举个例子，让我们看看<code>ourDog</code>:

```js
var ourDog = {
  "name": "Camper",
  "legs": 4,
  "tails": 1,
  "friends": ["everything!"]
};
```

让我们更改它的名称为 "Happy Camper"，这有两种方式来更新对象的<code>name</code>属性：
<code>ourDog.name = "Happy Camper";</code> 或
<code>ourDog["name"] = "Happy Camper";</code>
现在，<code>ourDog.name</code>的值就不再是 "Camper"，而是 "Happy Camper"。
</section>

## Instructions
<section id='instructions'>
更新<code>myDog</code>对象的<code>name</code>属性，让它的名字从 "Coder" 变成 "Happy Coder"。
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: 更新<code>myDog</code>的<code>"name"</code>属性, 使其等于 "Happy Coder"。
    testString: assert(/happy coder/gi.test(myDog.name));
  - text: 不要修改<code>myDog</code>的定义。
    testString: 'assert(/"name": "Coder"/.test(code));'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
// Example
var ourDog = {
  "name": "Camper",
  "legs": 4,
  "tails": 1,
  "friends": ["everything!"]
};

ourDog.name = "Happy Camper";

// Setup
var myDog = {
  "name": "Coder",
  "legs": 4,
  "tails": 1,
  "friends": ["freeCodeCamp Campers"]
};

// Only change code below this line.


```

</div>


### After Test
<div id='js-teardown'>

```js
(function(z){return z;})(myDog);
```

</div>

</section>

## Solution
<section id='solution'>


```js
var myDog = {
  "name": "Coder",
  "legs": 4,
  "tails": 1,
  "friends": ["freeCodeCamp Campers"]
};
myDog.name = "Happy Coder";
```

</section>