97 lines
1.4 KiB
Markdown
97 lines
1.4 KiB
Markdown
---
|
|
id: 56bbb991ad1ed5201cd392d3
|
|
title: 刪除對象的屬性
|
|
challengeType: 1
|
|
videoUrl: 'https://scrimba.com/c/cDqKdTv'
|
|
forumTopicId: 17560
|
|
dashedName: delete-properties-from-a-javascript-object
|
|
---
|
|
|
|
# --description--
|
|
|
|
我們同樣可以刪除對象的屬性，例如：
|
|
|
|
```js
|
|
delete ourDog.bark;
|
|
```
|
|
|
|
例如：
|
|
|
|
```js
|
|
const ourDog = {
|
|
"name": "Camper",
|
|
"legs": 4,
|
|
"tails": 1,
|
|
"friends": ["everything!"],
|
|
"bark": "bow-wow"
|
|
};
|
|
|
|
delete ourDog.bark;
|
|
```
|
|
|
|
在上面代碼的最後一行中，`ourDog` 是這樣的：
|
|
|
|
```js
|
|
{
|
|
"name": "Camper",
|
|
"legs": 4,
|
|
"tails": 1,
|
|
"friends": ["everything!"]
|
|
}
|
|
```
|
|
|
|
# --instructions--
|
|
|
|
刪除 `myDog` 對象的 `tails` 屬性。 可以使用點操作符或者中括號操作符。
|
|
|
|
# --hints--
|
|
|
|
應該從 `myDog` 中刪除 `tails` 屬性。
|
|
|
|
```js
|
|
assert(typeof myDog === 'object' && myDog.tails === undefined);
|
|
```
|
|
|
|
不要修改 `myDog` 的初始化代碼。
|
|
|
|
```js
|
|
assert(code.match(/"tails": 1/g).length > 0);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --after-user-code--
|
|
|
|
```js
|
|
(function(z){return z;})(myDog);
|
|
```
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
// Setup
|
|
const myDog = {
|
|
"name": "Happy Coder",
|
|
"legs": 4,
|
|
"tails": 1,
|
|
"friends": ["freeCodeCamp Campers"],
|
|
"bark": "woof"
|
|
};
|
|
|
|
// Only change code below this line
|
|
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
const myDog = {
|
|
"name": "Happy Coder",
|
|
"legs": 4,
|
|
"tails": 1,
|
|
"friends": ["freeCodeCamp Campers"],
|
|
"bark": "woof"
|
|
};
|
|
delete myDog.tails;
|
|
```
|