74 lines
2.0 KiB
Markdown
74 lines
2.0 KiB
Markdown
---
|
||
id: 56533eb9ac21ba0edf2244cc
|
||
title: Accessing Nested Objects
|
||
challengeType: 1
|
||
guideUrl: 'https://chinese.freecodecamp.org/guide/certificates/accessing-nested-objects-in-json'
|
||
videoUrl: ''
|
||
localeTitle: 访问嵌套对象
|
||
---
|
||
|
||
## Description
|
||
<section id="description">可以通过将点或括号表示法链接在一起来访问对象的子属性。这是一个嵌套对象： <blockquote> var ourStorage = { <br> “桌子”：{ <br> “抽屉”：“订书机” <br> }， <br> “内阁”：{ <br> “顶级抽屉”：{ <br> “folder1”：“一个文件”， <br> “folder2”：“秘密” <br> }， <br> “底部抽屉”：“苏打水” <br> } <br> }; <br> ourStorage.cabinet [“top drawer”]。folder2; //“秘密” <br> ourStorage.desk.drawer; //“订书机” </blockquote></section>
|
||
|
||
## Instructions
|
||
<section id="instructions">访问<code>myStorage</code>对象并将<code>glove box</code>属性的内容分配给<code>gloveBoxContents</code>变量。对于名称中包含空格的属性，请使用括号表示法。 </section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: <code>gloveBoxContents</code>应该等于“地图”
|
||
testString: 'assert(gloveBoxContents === "maps", "<code>gloveBoxContents</code> should equal "maps"");'
|
||
- text: 使用点和括号表示法访问<code>myStorage</code>
|
||
testString: 'assert(/=\s*myStorage\.car\.inside\[\s*("|")glove box\1\s*\]/g.test(code), "Use dot and bracket notation to access <code>myStorage</code>");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
// Setup
|
||
var myStorage = {
|
||
"car": {
|
||
"inside": {
|
||
"glove box": "maps",
|
||
"passenger seat": "crumbs"
|
||
},
|
||
"outside": {
|
||
"trunk": "jack"
|
||
}
|
||
}
|
||
};
|
||
|
||
var gloveBoxContents = undefined; // Change this line
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
### After Test
|
||
<div id='js-teardown'>
|
||
|
||
```js
|
||
console.info('after the test');
|
||
```
|
||
|
||
</div>
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|