88 lines
1.4 KiB
Markdown
88 lines
1.4 KiB
Markdown
---
|
||
id: 56bbb991ad1ed5201cd392d2
|
||
title: 给 JavaScript 对象添加新属性
|
||
challengeType: 1
|
||
videoUrl: 'https://scrimba.com/c/cQe38UD'
|
||
forumTopicId: 301169
|
||
dashedName: add-new-properties-to-a-javascript-object
|
||
---
|
||
|
||
# --description--
|
||
|
||
你也可以像更改属性一样给 JavaScript 对象添加属性。
|
||
|
||
这里展示了如何给 `ourDog` 添加一个属性 `bark`：
|
||
|
||
`ourDog.bark = "bow-wow";`
|
||
|
||
或者
|
||
|
||
`ourDog["bark"] = "bow-wow";`
|
||
|
||
现在，当我们执行 `ourDog.bark` 时，我们就能得到他的叫声，`bow-wow`。
|
||
|
||
例如：
|
||
|
||
```js
|
||
var ourDog = {
|
||
"name": "Camper",
|
||
"legs": 4,
|
||
"tails": 1,
|
||
"friends": ["everything!"]
|
||
};
|
||
|
||
ourDog.bark = "bow-wow";
|
||
```
|
||
|
||
# --instructions--
|
||
|
||
给 `myDog` 添加一个属性 `bark` ，并将其设置为狗的声音，比如“woof“. 你可以使用点号表示法或方括号表示法来完成此挑战。
|
||
|
||
# --hints--
|
||
|
||
你应该将属性 `bark` 添加到 `myDog`。
|
||
|
||
```js
|
||
assert(myDog.bark !== undefined);
|
||
```
|
||
|
||
你不应该在 Setup 部分添加 `bark`。
|
||
|
||
```js
|
||
assert(!/bark[^\n]:/.test(code));
|
||
```
|
||
|
||
# --seed--
|
||
|
||
## --after-user-code--
|
||
|
||
```js
|
||
(function(z){return z;})(myDog);
|
||
```
|
||
|
||
## --seed-contents--
|
||
|
||
```js
|
||
// Setup
|
||
var myDog = {
|
||
"name": "Happy Coder",
|
||
"legs": 4,
|
||
"tails": 1,
|
||
"friends": ["freeCodeCamp Campers"]
|
||
};
|
||
|
||
// Only change code below this line
|
||
```
|
||
|
||
# --solutions--
|
||
|
||
```js
|
||
var myDog = {
|
||
"name": "Happy Coder",
|
||
"legs": 4,
|
||
"tails": 1,
|
||
"friends": ["freeCodeCamp Campers"]
|
||
};
|
||
myDog.bark = "Woof Woof";
|
||
```
|