2018-10-10 22:03:03 +00:00
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---
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id: 56bbb991ad1ed5201cd392d1
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2021-03-15 03:20:39 +00:00
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title: 更新对象属性
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2018-10-10 22:03:03 +00:00
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challengeType: 1
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2020-04-29 10:29:13 +00:00
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videoUrl: 'https://scrimba.com/c/c9yEJT4'
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forumTopicId: 18336
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2021-01-13 02:31:00 +00:00
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dashedName: updating-object-properties
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2021-03-15 03:20:39 +00:00
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在你创建了 JavaScript 对象后,你可以随时更新它的属性,就像更新任何其他变量那样。 你可以使用点或中括号操作符来更新。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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举个例子,让我们看看 `ourDog`:
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2020-04-29 10:29:13 +00:00
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```js
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2021-10-27 15:10:57 +00:00
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const ourDog = {
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2020-04-29 10:29:13 +00:00
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"name": "Camper",
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"legs": 4,
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"tails": 1,
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"friends": ["everything!"]
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};
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```
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2021-03-15 03:20:39 +00:00
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既然他是一个特别愉快的狗,让我们将他的名字更改为字符串 `Happy Camper`。 这有两种方式来更新对象的 name 属性: `ourDog.name = "Happy Camper";` 或 `ourDog["name"] = "Happy Camper";`。更新后,`ourDog.name` 的值就不再是 `Camper`,而是 `Happy Camper`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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更新 `myDog` 对象的 name 属性。 让它的名字从 `Coder` 变成 `Happy Coder`。 你可以使用点号表示法或方括号表示法来完成此挑战。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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更新 `myDog` 的 `name` 属性,使其等于 `Happy Coder`。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert(/happy coder/gi.test(myDog.name));
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2018-10-10 22:03:03 +00:00
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```
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2021-03-15 03:20:39 +00:00
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不要修改 `myDog` 的定义。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert(/"name": "Coder"/.test(code));
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2018-10-10 22:03:03 +00:00
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```
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2021-01-13 02:31:00 +00:00
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# --seed--
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## --after-user-code--
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```js
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(function(z){return z;})(myDog);
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```
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## --seed-contents--
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```js
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// Setup
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2021-10-27 15:10:57 +00:00
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const myDog = {
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2021-01-13 02:31:00 +00:00
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"name": "Coder",
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"legs": 4,
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"tails": 1,
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"friends": ["freeCodeCamp Campers"]
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};
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// Only change code below this line
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2021-10-27 15:10:57 +00:00
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2021-01-13 02:31:00 +00:00
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-04-29 10:29:13 +00:00
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2021-01-13 02:31:00 +00:00
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```js
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2021-10-27 15:10:57 +00:00
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const myDog = {
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2021-01-13 02:31:00 +00:00
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"name": "Coder",
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"legs": 4,
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"tails": 1,
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"friends": ["freeCodeCamp Campers"]
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};
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myDog.name = "Happy Coder";
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```
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