58 lines
1002 B
Markdown
58 lines
1002 B
Markdown
---
|
|
id: 56533eb9ac21ba0edf2244cd
|
|
title: 访问嵌套数组
|
|
challengeType: 1
|
|
videoUrl: 'https://scrimba.com/c/cLeGDtZ'
|
|
forumTopicId: 16160
|
|
---
|
|
|
|
# --description--
|
|
|
|
正如我们在前面的例子所见,对象可以嵌套对象和数组。与访问嵌套对象一样,用中括号操作符同样可以访问嵌套数组。
|
|
|
|
下面是如何访问嵌套数组的例子:
|
|
|
|
```js
|
|
var ourPets = [
|
|
{
|
|
animalType: "cat",
|
|
names: [
|
|
"Meowzer",
|
|
"Fluffy",
|
|
"Kit-Cat"
|
|
]
|
|
},
|
|
{
|
|
animalType: "dog",
|
|
names: [
|
|
"Spot",
|
|
"Bowser",
|
|
"Frankie"
|
|
]
|
|
}
|
|
];
|
|
ourPets[0].names[1]; // "Fluffy"
|
|
ourPets[1].names[0]; // "Spot"
|
|
```
|
|
|
|
# --instructions--
|
|
|
|
使用点操作符和中括号操作符来检索变量`myPlants`的第二棵树。
|
|
|
|
# --hints--
|
|
|
|
`secondTree`应该等于 "pine"。
|
|
|
|
```js
|
|
assert(secondTree === 'pine');
|
|
```
|
|
|
|
使用点操作符和中括号操作符来检索变量`myPlants`。
|
|
|
|
```js
|
|
assert(/=\s*myPlants\[1\].list\[1\]/.test(code));
|
|
```
|
|
|
|
# --solutions--
|
|
|