freeCodeCamp/curriculum/challenges/chinese-traditional/03-front-end-development-li.../bootstrap/add-id-attributes-to-bootst...

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---
id: bad87fee1348bd9aec908853
title: 給 Bootstrap 元素添加 id 屬性
challengeType: 0
forumTopicId: 16639
dashedName: add-id-attributes-to-bootstrap-elements
---
# --description--
回憶一下,除了可以給元素添加 class 屬性,我們還可以給元素設置 `id` 屬性。
每個元素的 id 都必須是唯一的,並且在一個頁面中只能使用一次。
讓我們爲每個 class 爲 `well``div` 元素添加一個唯一的 id。
記住,可以這樣給一個元素設置 id
```html
<div class="well" id="center-well">
```
給左邊的塊設置 id 爲 `left-well`。 給右邊的塊設置 id 爲 `right-well`
# --hints--
左邊的 `well` 的 id 應爲 `left-well`
```js
assert(
$('.col-xs-6').children('#left-well') &&
$('.col-xs-6').children('#left-well').length > 0
);
```
右邊的 `well` 的 id 應爲 `right-well`
```js
assert(
$('.col-xs-6').children('#right-well') &&
$('.col-xs-6').children('#right-well').length > 0
);
```
# --seed--
## --seed-contents--
```html
<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
<div class="row">
<div class="col-xs-6">
<div class="well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
<div class="col-xs-6">
<div class="well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
</div>
</div>
```
# --solutions--
```html
<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
<div class="row">
<div class="col-xs-6">
<div class="well" id="left-well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
<div class="col-xs-6">
<div class="well" id="right-well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
</div>
</div>
```